Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/ works/8057467. Rating: Explicit Archive Warning: Underage Category: M/M Fandom: モブサイコ100_|_Mob_Psycho_100 Relationship: Hanazawa_Teruki/Kageyama_"Mob"_Shigeo, Kageyama_Ritsu/Kageyama_"Mob" Shigeo, Kageyama_Ritsu/Suzuki_Shou, Hanazawa_Teruki/Kageyama_"Mob" Shigeo/Kageyama_Ritsu/Suzuki_Shou Character: Kageyama_Ritsu, Kageyama_"Mob"_Shigeo, Suzuki_Shou, Hanazawa_Teruki Additional Tags: Established_Relationship, Crossdressing, Truth_or_Dare, Blow_Jobs, Mutual Masturbation, Quickshot_Boys, First_Time, Sibling_Incest, Size_Kink, on the_small_side_instead_of_the_big_one_lol, Plot_What_Plot/Porn_Without Plot Stats: Published: 2016-09-17 Words: 4364 ****** Playing Games ****** by twitchtipthegnawer Summary A sleepover party sounds like a good idea, at first. It was going to be a whole lot of fun and messing around and brotherly bonding via a nice game of truth or dare. So why on earth did Ritsu find himself studiously trying to ignore the fact that he was wearing a dress, and apparently Mob owned a schoolgirl uniform? (This is tentatively a sequel to Absolutely No Ulterior Motives, but can be read as a standalone. A smutty, smutty standalone.) Notes ALL ABOARD THE SHAMELESS SMUT WAGON. This fic was a nightmare of trying to use the right names for everyone, debating over whether or not to use honorifics, suffering because Ritsu and Mob have the same last name, suffering more because everyone uses the same pronouns, and wondering if it would be worth it to make the set-up even vaguely realistic. It’s done though. I did it. Bask in the glory of Problematic Smut, featuring as much fluff as I could cram in. Ritsu looked down at the outfit he was wearing, and vowed to himself to burn it as soon as it came off. Because this was the absolute last time he was going to wear anything like it. It had been a stupid idea, keeping it in the first place. He wasn’t sure why he’d done it. He certainly hadn’t been expecting to have to wear it again. But he supposed that all bets were off as soon as he’d invited Shou over. It had just been really perfect timing, with his parents out of town and Shou needing somewhere to stay after his visit with his dad. Ritsu figured maybe he could get his brother and Shou to get along, if he was persuasive enough. But then Mob had invited Teru, and it had become something of a sleepover party. And sleepover parties meant playing sleepover games, which should have been fine, except that apparently Shou wanted truth or dare. Mob hadn’t expressed much of an opinion either way, and Teru had seconded, so Ritsu hadn’t complained too much. If he’d known what topic they’d end up on, though, he would’ve never said yes. It had started with Shou getting a mischievous look in his eyes, and saying, “Kageyama, have you had your first kiss yet?” He’d been sure, absolutely sure, that Mob would say no. He knew his big brother better than anyone, but then a light blush had appeared on his cheeks, and Ritsu’s mind had blanked. “Yes,” Mob said, bashful and shy in a way that went straight over Shou’s head. “Really?” Shou said, a wide grin splitting his face. “Who?” Mob looked away and said, “You only get one truth.” Teru gave Mob an odd look at that, but Ritsu’s brain was still stalled out over the thought of Mob kissing. He almost missed when Mob asked him, “Ritsu, truth or dare?” “Uh, truth,” Ritsu said absently. “Have… you ever kissed someone?” Mob actually sounded mildly interested, which was the only reason Ritsu caught the question. He immediately wished he’d stayed in his dazed head. “No fair!” Shou protested. “You can’t steal my question!” Much as Ritsu wanted to protest, this was a lot better than some of the questions Mob could’ve asked him. “No,” Ritsu said, a little embarrassed. He’d sort of always thought he would beat his big brother to the punch, but apparently not. Shou gave Ritsu a grin. “Liar,” he declared, making Teru blink hard and Mob’s eyes go wide. Ritsu flushed, but set his jaw. “I’m not a liar,” he said. “That time didn’t count.” Teru was looking between Ritsu and Shou shrewdly, but he didn’t comment. If it had only been him and Mob, maybe this would’ve been less embarrassing, but he didn’t really know Teru. “Did too--” “Hanazawa, truth or dare?” Ritsu asked quickly, because really, he looked entirely too shrewd for his own good. Smiling and propping his hand under his chin, Teru said, “Truth.” Shou was sputtering in the background, but Ritsu didn’t give him a chance to get a word in edgewise. “Do you have a crush on anyone?” Hopefully, that would be enough to get Shou to shut up for a second. He loved inciting trouble, but he could do that with Teru’s answer just as easily as Ritsu’s. To his surprise, Teru just smiled wider, saying “Yes.” He looked totally relaxed and casual about it, but Mob’s mouth dropped open slightly, and he turned to look at Teru with something shining in his eyes. He was always so happy to hear that other people were happy, it was strange. Teru’s hand dropped to Mob’s, holding it for a quick squeeze. Ritsu blinked in surprise, remembering the first time he’d met Teru. He didn’t have long to wonder about the gesture, though, because then Teru’s smile turned a bit predatory. “Suzuki, who was Kageyama’s first kiss with?” Oh, that jerk. Shou looked so pleased with himself, giggling in a way that was obviously supposed to sound like a chuckle. His voice was way too high for it, though; Ritsu didn’t know why he bothered when neither of their voices had broken yet. “Me.” “I said it didn’t count,” Ritsu gritted out. His voice was too low to drown out the strangled, startled noise that came out of Mob’s throat. “I’m not, not,” he swallowed hard. He was nowhere near ready for this conversation. “Ritsu,” Mob said, still sounding a bit strangled. When Ritsu met his eyes, all hesitance and worry bubbling in his gut, Mob just smiled. “It’s fine. I’m, um, I’m bi, so…” Shock ripped through Ritsu’s brain, even worse than the last time Mob had dropped a bomb. Well, at least he wasn’t panicking anymore. “Oh,” he said, eloquently. “Yeah, no worries Kageyama,” Teru said. He looked far less teasing now, a concerned little crease between his eyebrows. How were all of Mob’s friends so weirdly nice? “Guess we’ve all got something in common, besides psychic powers.” Yeah, that was a nice-- Wait, what? “You too?” Shou asked, sounding surprised and trying for suave. He missed the mark completely, of course, but Ritsu could commend his efforts (not that he would, but he could). “Nice. Hey, is it my turn now? I kinda did truth.” “Sure,” Teru said. Ritsu squinted at him, trying to figure out if he was gay or not. Then he realized Teru was wearing a pink sweater with strawberry milk cartons printed all over it, and, yeah he had been a bit blind. “Truth or dare?” Shou asked RItsu, poking him in the shoulder to get his attention. Scowling to cover how put off he still was, Ritsu said, “Dare.” There, now Shou couldn’t ask him who he had a crush on, at least. Instead of looking frustrated, though, Shou winked. “Dare you to put on the outfit you were wearing when we kissed,” he said. Ritsu’s scowl turned into a glare rather quickly. “No,” he said. Shou opened his mouth to argue, and Ritsu slapped a palm over his mouth. It got him a blush, which was what he was aiming for. Shou was pretty good about giving in when Ritsu really put his foot down, in general. The damage was already done, apparently, because Mob looked thoroughly confused. “What’s wrong with what you were wearing?” He asked, all innocent curiosity. “It was at the culture festival,” Ritsu said, looking at the floor. He really, really hoped Mob hadn’t heard of what his class planned for the event. “And it was an accident, so it doesn’t count!” Teru’s eyes were flicking between Ritsu and Shou, a small smile on his lips. “Come on Kageyama, it can’t be that embarrassing. Shigeo’s had to wear strange things for work before.” Mob blushed so bright that even Shou took notice, which was weird enough. “It was just because we had a job at a girl’s school,” Mob muttered. “It wasn’t that embarrassing.” He definitely looked embarrassed, though, even when Teru squeezed his shoulder comfortingly. A girl’s school? Shou realized it at the same moment RItsu did, and then Ritsu was left staring at him in horror while a grin spread across his face again. “Ritsu, will you do the dare if Kageyama dresses up too?” Face heating up, Ritsu shook his head vehemently. Before he could protest aloud, Mob was already saying a quiet, “What?” His eyes were wide, and sweat was starting to bead on his forehead. “Would you mind, Shigeo?” Teru said. He looked at Mob’s face carefully, and apparently noticed something not even Ritsu did when they locked eyes. “C’mon, it would make Kageyama feel better.” Swallowing hard, Mob nodded. Every muscle in Ritsu’s body felt like it froze, Teru and Shou both looking at him expectantly. Mob stood, then held his hand out to Ritsu like he needed help getting up. He wanted to protest again, but they’d all ganged up on him. What else could he do? Which was how he ended up in the closet, clutching his skirt in one fist and well on his way to crushing the doorknob with the other. Mob had used his own bedroom to change, and Ritsu had crammed himself into the closet. The petticoat under his skirt was itchy, the ruffly headband thing was uncomfortable, and Ritsu couldn’t shake the feeling that he looked like creepy fetish bait. He’d been so determined to not have to wear this outfit even once, and now he’d worn it twice. If Shou kissed him again, “I thought you were a girl” would not be a good enough excuse to save him. It didn’t matter that Ritsu was the weakest esper at the party, he would flatten Shou in two seconds flat. This was going to be embarrassing enough without extra teasing. “Hurry up!” Shou shouted through the door. Speak of the devil, and all that. “Your brother’s waiting in the hall, he doesn’t wanna walk in until you do. This is so boring.” The thought of Mob sitting out there, probably even more flustered than Ritsu was, finally spurred him into action. Shou knew him too well. He opened the door to see Shou’s lightly freckled face a whole lot closer than he’d thought he’d be, though thankfully Teru was turned away. “You can come out, Shigeo,” Teru said. His voice was all gentle again, which was good because Mob looked like he was about to faint when he walked into the room. Heck, Ritsu felt like he was about to faint. Mob looked cute. Mob looked really, really cute. His skirt was shorter than Ritsu’s, and even if he wasn’t wearing a dress there was no mistaking that blouse for something a boy would wear. The way it was cut made him look even more slender and feminine, and Ritsu really shouldn’t be looking at his own brother like that. A strangled noise drew Ritsu’s attention back to Shou. Through some miracle, he was blushing brighter than Ritsu was. Maybe because he was a redhead? The last time Ritsu had worn this outfit, he hadn’t made that noise. It was sort of stalling Ritsu’s brain out. “Well!” Teru said, abruptly enough that Ritsu started in surprise. “Now that we’re done with that dare, should we start the game again?” Sitting in the skirt was awkward, to say the least. Ritsu kind of found himself wishing that he had tights to shield him from the petticoat, though the way Shou’s eyes kept wandering to his bare legs was… “It’s your turn, Ritsu,” Mob said softly. He was sitting beside Teru, listing into him a bit as if he wanted to hide behind his back. Ritsu got the sentiment, but Shou was way too small to hide behind. “Okay, um. Truth or dare, Shigeo?” Ritsu asked, fighting to keep his eyes on Mob’s face. It was hard, when he could feel Shou staring at him, and Mob’s legs were-- “Truth,” Mob said. His gaze was focused somewhere around Ritsu’s left ear. Unfortunately, Ritsu had no idea what to ask Mob. He floundered, until he remembered something from earlier in their conversation. Suddenly, he found himself giving Teru a suspicious look. “Why did Hanazawa know you wore this for a job?” “Oh, that’s,” Mob looked at Teru, his mouth opening and closing several times as if he wasn’t sure what to say. Teru was also blushing, and Ritsu was starting to think that maybe this whole game had been a bad plan from the beginning. “He saw it in my closet,” Mob finished eventually. “Right,” Shou said with another giggle. “What were you doing in Kageyama’s closet, Hanazawa?” In a move that was supposed to look casual and utterly failed, Teru slung his arm around Mob’s shoulders. Mob relaxed the tiniest bit, but Teru’s spine was way too straight and his smile was too stiff. “Not your turn, Suzuki,” he pointed out. “Truth or dare, Teruki?” Mob’s voice trembled a little on his name, and Teru actually jumped a bit at the sound. After a short pause, Teru said, “Truth.” Ritsu chanced a glance at Shou, and sure enough, his eyes were still glued to Ritsu. When he got caught staring he blushed brighter, but he didn’t look away. He just licked his lips, leaving them looking wet and soft and Ritsu needed to not think of that. “Who do you have a crush on?” Mob said. He had a small smile on his lips, and between that and his relaxed shoulders he looked the most at ease out of all of them. Which was weird, right? It was weird to be totally calm about his short skirt and knee high socks. “You know,” Teru complained. Ritsu coughed, surprise making his chest feel too tight. “There’s no rule against asking questions you already know the answer to,” Mob said shyly. He sounded almost coy. Ritsu needed a glass of water. Something devious glinted in Teru’s eyes. “I’ll say if you pick dare next time it’s your turn,” he said. Mob’s eyes went a bit wide, but he nodded, and Teru covered his face with his hand and said, “You.” He didn’t take his arm off of Mob’s shoulders. What? Everyone in the room turned to look at Ritsu at once, and he realized he’d spoken out loud. Which was embarrassing, but-- what? “Are you two dating?” He squeaked. He couldn’t help his voice going so high, he was just shocked, was all. “Yes,” Teru said, still hiding his face. Ritsu was still puzzling over whether or not he should feel angry about that when Teru’s hand dropped to his lap, and he said. “Shigeo, truth or dare?” “No fair!” Shou said, before Mob could give the obvious answer. “You guys are leaving me out.” “I promise, you won’t mind,” Teru said. Then he looked at Mob, took a deep breath, and completely erased all thoughts of getting angry from Ritsu’s mind. “I dare you to kiss your brother.” At least Mob looked as floored as Ritsu was. “W-why?” He said, small hands balled up in nervous fists. Ritsu looked down and noticed that he’d grabbed onto his own skirt, white ruffles in disarray. Part of him wanted badly to run out of the room, but a bigger part was horribly, desperately curious. Aside from the brief kiss with Shou, Ritsu had never kissed anyone before. And Mob looked so cute. But Mob was also his brother and Ritsu really should’ve felt more disgusted than curious. Shrugging, Teru said, “It’s a dare. Kageyama doesn’t look like he minds too much.” Ritsu’s head snapped up to say that he did, in fact, mind, but then he saw Mob licking his lips again. He was nervous, that was all, that was totally why his heart was pounding. “Okay,” Mob said, so soft that Ritsu barely heard it over the pounding of his heart. He went up on his hands and knees, crawling towards Ritsu in a smooth movement that closed the distance between them way too quickly. Ritsu was anything but ready. Behind Mob, Teru made an undignified noise. It took Ritsu a full second to realize that Mob’s skirt was riding up and Teru could see his underwear. He couldn’t think about that, though, not with Mob’s breath warming his lips. Shou was staring so hard Ritsu could feel his skin prickle with it. Tension built in Ritsu’s muscles, making the dress feel too tight. It was entirely too much, he was shaking, he couldn’t look away from Mob’s lips, the faint sheen on them like lipgloss. He was probably a bad person for wanting this so badly. He didn’t particularly care. He didn’t care at all when Mob leaned the tiniest bit forward and kissed him. Unlike the quick peck on the lips Shou had given him, this one lingered. It was just a slow press of skin on skin, all gentle, closed-lipped sliding. Ritsu’s mouth opened a little, and Mob captured his bottom lip for a single, searing moment. Ritsu felt like he was going to implode, and the feeling only intensified when Mob brushed the tip of his tongue against Ritsu’s lips the moment before he pulled away. Staring into his big brother’s glazed eyes, Ritsu found himself very, very glad for the way the petticoat puffed out his skirt. Built in camouflage. “Oh my god,” Shou said, sounding strangled. His hand landed between Ritsu’s shoulderblades, and Ritsu was about to turn his head when he noticed Mob smiling, small and nervous. But then the smile melted away abruptly, and Mob’s eyes squeezed shut, and he whined. “Sorry!” Teru said. Where Shou had been strangled, Teru was breathless. “You just, ah, I could see your underwear, and I just acted on instinct.” Peeking around Mob’s shoulder, Ritsu could just barely make out the shape of Teru’s hands under Mob’s skirt, groping him. There was a long list of reactions that would probably be appropriate for the sudden knowledge that his brother’s boyfriend was groping him, and none of them were his dick getting even harder. “Ritsu,” Shou said, hand grabbing onto his dress. “Look at me.” Dazed into obedience, Ritsu turned his head. Shou captured his lips immediately, pressing against Ritsu’s side in a display of affection that left Ritsu even more confused than he already was. He could feel Mob pulling away, could hear Teru say something, but it was hard to focus on. Shou didn’t kiss with any finesse at all, but his teeth on Ritsu’s lips were not helping his concentration. Shou’s hands gripping his hips and pulling him closer so they could press chest-to-chest didn’t help at all. They were both breathing hard when they broke apart, even though the kiss hadn’t exactly been deep or long. It was just more than Ritsu was used to, that was all. Shou’s bitten lips looked so red and tempting that Ritsu almost leaned down for another kiss, but then Shou’s eyes slid to the side and went impossibly wide. “I changed my mind about your brother,” he said, voice cracking. “He’s really, really great.” His sudden change of heart probably had something to do with the fact that Teru had pulled Mob into his lap, and the way Mob’s skirt rode up over his hands gave them both a very good view of Mob’s underwear. Mob’s lacy, pink, decidedly girly underwear. Since when did his brother own panties? A small hand slid under his skirt while Ritsu was busy staring at his brother’s lithe body grinding into Teru’s. It definitely caught his attention when Shou palmed his dick, especially because he was just a bit too firm to be comfortable. For how small he was, Ritsu always forgot he was strong. “Knew it,” Shou breathed, his mouth dangerously close to Ritsu’s neck. The trembling wracking Ritsu’s frame was half because of the feeling of Shou’s hand between his legs, and half because of Mob. When he looked down and saw Shou’s flushed face, the spike of lust down his spine was all Shou. His smile had been replaced by slack lips just this side of overwhelmed, and his hair was still too perfect, begging for RItsu’s hands to mess it up. Well, Ritsu had already thrown out all of his dignity when he’d put on the outfit, so he gave in and ran five fingers through the red, bristly locks. Shou stared at him like he wasn’t sure what was going on but he liked it, and then Ritsu decided to take a page out of Teru’s book. Instinct told Ritsu to fist his hand in Shou’s hair and drag him in for another kiss. This time they did use their tongues, and the first gasp Shou gave when he tasted Ritsu’s was even sweeter than Mob’s kiss had been. Shou tasted like heat and spices, which wasn’t Ritsu’s usual favorite but he was certainly not complaining at the moment. Clinging to RItsu’s shoulders like his life depended on it, Shou kissed back as best he could. Neither of them knew what they were doing, and their noses kept bumping together. When their teeth clacked painfully they finally pulled back, staring at each other with wide eyes. It didn’t matter that it was awkward, Ritsu still enjoyed it. Way, way too much. Still following his instincts, Ritsu licked the freckles on Shou’s cheek. Squeaking indignantly, Shou moved to push him off, but then they both heard the trembling voice only a couple of feet away. “T-Teruki.” While Shou and Ritsu had been kissing each other senseless, Teru had taken off Mob’s blazer and undone most of the buttons on his shirt. The bottom two were still in place, but it didn’t matter, because Ritsu could clearly see the bra that Mob was wearing. A bra. There was no way that had been necessary for a job. Teru had both his hands buried in Mob’s hair, much the same way Ritsu’s were buried in Shou’s, but he was using his grip to direct Mob downwards. As they watched, Teru spread his legs and Mob settled between them, moving like they’d-- like they’d done this before. Ritsu brought his hand to his mouth and bit his fingers without even thinking, trying to stop himself from making a sound. Shou didn’t bother, all of his weight slumping against Ritsu as he whispered, “Oh my god.” “Don’t worry,” Teru said to Mob. “They don’t mind, Shigeo. You look so pretty like this.” His hands gentled in Mob’s hair, petting until he started making small, breathy sounds. Unbuttoning Teru’s pants with shaking hands, Mob chanced a glance at Ritsu and Shou. He flushed impossibly brighter at the way they were both staring, but he still nuzzled Teru’s thigh obediently. Moving so slowly that it was almost torture, Mob slid Teru’s dick free from his pants, then looked up at him like he was waiting for a signal. Hips twitching, Shou buried his face in RItsu’s shoulder. “Oh my god,” he said again, but Ritsu couldn’t focus because Shou was hard against his thigh and Mob was tenting his skirt and drooling precome through his panties, and his mouth was opening to allow his tongue to flick at the head of Teru’s dick. The same tongue that had been on Ritsu’s lips. Both Ritsu and Shou missed the moment Mob took Teru into his mouth, though, because Shou abruptly jerked and upset their balance, leaving Ritsu on his back and Shou sprawled on top of him. Shou didn’t weigh much, so it wasn’t like he would have minded, except that Mob was making wet sounds and Ritsu desperately wanted to be able to see. “Ritsu, please,” Shou whimpered. Half because Ritsu wanted to see Shou come apart completely, and half because he wanted Shou to calm down enough to let him watch, Ritsu jammed his hand between their bodies and into Shou’s pants. It was hard, with the way Shou was panting and shifting restlessly, but Ritsu managed to get his hand wrapped around Shou’s dick. It was as small as the rest of him, and Ritsu couldn’t help but think, cute. It only took a couple of strokes before Shou was spilling liquid heat all over RItsu’s hand, muffling his sounds into Ritsu’s chest. The dress was an absolute wreck, drool and sweat making it stick to Ritsu in patches. But Mob was an even bigger mess. Deciding between looking down at Shou’s slack face while aftershocks ran through him and looking at Mob while Teru slowly rocked his hips into his mouth was hard. It was quite possibly one of the hardest decisions in Ritsu’s life. Mob was so powerful, so unshakeable, and yet there he was on the floor with a dick in his mouth. His hips were rocking against nothing, his lips were swollen, a couple of tears slid down his cheeks before Teru thumbed them away. Mob looked delicious. Of course, all of them were only teenagers. There was no way Teru was going to last long, even if he was more experienced than Shou was. He hastily pulled Mob off, just in time to come all over his face. Mob looked as dazed as Shou did, creamy white dripping from his lips and cheeks. Teru barely had to brush his fingers against Mob to get him to cum, soaking the panties in the process. Shou was still catching his breath, so Ritsu was wholly unprepared for his hand finding Ritsu under his skirt again. “Ritsu,” Shou said, a little bit of his usual cockiness finding its way into his voice again. “You can come now.” If Ritsu had been able to do anything other than moan, he would’ve snapped that he didn’t need permission. But something about Shou’s voice had set him off anyway, and he couldn’t help that he was coming into the skirt, probably ruining the stupid petticoat. It was so much better than every time Ritsu had touched himself, and Shou had barely given him any contact at all. Ritsu was never going to live this down. They cleaned themselves off in awkward silence, after that. Ritsu’s head felt so full of noise that he didn’t think he’d be able to piece together a coherent sentence if he tried. When he emerged from his closet once again, though, finally back in normal clothes, he found Shou sitting in his room alone. “Your brother’s boyfriend says we should probably stop playing truth or dare,” Shou said, not quite meeting Ritsu’s eyes. Brother’s boyfriend. “So, uh, we’re going to watching a movie?” He made it sound like a question, which wasn’t helping Ritsu’s slower-than-normal thoughts to catch up. “He’s downstairs popping popcorn. Wanna head down?” Taking a deep breath, Ritsu tried to calm himself down. Whatever had just happened wasn’t going to be helped by his overthinking. He just really, really hoped Mob and Shou didn’t regret it. And Teru too, he supposed. Because a piece of him was kind of hoping… But that was for another day. “Sure,” RItsu said, forcing a smile with the same ease he’d always had. “Let’s go.” Please drop_by_the_archive_and_comment to let the author know if you enjoyed their work!