Sonic GeneXXX 2
Genderswap Special! (2/4 pairs genderswapped)
Pairings - Espio x Katie; Punchy x Amy; Tommy x FemKosmo; Shadow x FemSonic

Note: Sonic the Hedgehog and related characters are (c) SEGA and 
Sonic Team. You knew that, right?
GeneX and related fanchars are (c) 2BIT (TheGreatGator), the author.


Previously, on Sonic GeneXXX...
(This chapter uses the last Yaoi chapter as the setup for the multiple pairings. Here's a brief summary in case you'd rather not read it)
The guys met up at the bar to discuss the Sonic situation, when Amy entered, effectively ending their meeting. Punchy and Amy exchanged insults before Punchy decided to teach her a lesson in a drinking contest.
Tommy wanted to discuss his feelings about having lost his virginity with his brother, Razor, but the elder porcupine was always either busy working or off with his new boyfriend, Ridley. So instead, Tommy got an offer from Kosmo to practice his sexual technique.
Espio was on his way to meet Katie for another date, believing they were getting ready to move on to the next level. He practiced a little sex with Silver before realizing he was late, and rushing to meet Katie.
After being fucked by several guys over the past few months, Sonic finally encountered Shadow. Instead of just fucking, Shadow passionately kissed Sonic. Afterwards, they were both stunned as Sonic underwent a sudden transformation into female form! Why did this happen??
Now, on to the sex!


Katie berated Espio for showing up late, but still invited him into her home regardless. "Actually, it's totally fine... Let's brush off the restaurant. More time for... dessert..." she said in a sultry voice, sitting back on her sofa in a sexy pose. Espio stared at her, smiling a little. "I suspected as much... I think I know the sort of relationship you want..." he said, striding over to her with a smirk. Her dead boyfriend was possibly not dead. Obviously, she just wanted someone to blow off steam with until Chet returned to her. Espio would gladly oblige. Dropping over her, Espio locked lips with the dark furred coyote and started unfastening her pants. She kissed him back eagerly and groped at his crotch, rubbing him there to work the chameleon up and reveal his cock. He purred softly as he started to harden, and pulling back from the kiss, quickly worked off her clothes, scattering them around the floor. Katie sat before him in her glory, her soft, dark furred breasts and wet, waiting pussy in full view. "Chet's a lucky guy... and right now, so am I." Espio smiled, his cock twitching in anticipation. He didn't hesitate to plunge his way into her pussy, making her gasp at the swiftness of his penetration! "Mmm... Nice, I'm feeling lucky now, too..." Katie murred. Pulling her down so she was lying along the length of the sofa, Espio started putting his earlier "practice" to work, thrusting into Katie's depths with quick, deep motions! Katie wrapped her legs around his scaly waist, moaning pleasantly with each thrust he made into her. The chameleon smiled, watching her pleased expressions below him. He leaned down and licked at her nipples, extending his long tongue across her rack to taste both tits at once. She gasped in surprise, smiling a bit. "Aaahhh, Espio! That's a trick I've never seen before..." she moaned, kissing his head as he continued to suck her breasts. Espio sped up his thrusts over time, holding her waist to steady her as he pounded her pussy! "Mmm... Katie... I'll cum soon... I-is that alright?" he asked after a while. Amidst her moans, Katie managed a reply. "Ahhh... Ohhh... Go ahead... Chet would understand..." she panted, pulling Espio close and kissing him in a fit of lust, possibly picturing her beloved Cheetah in his place. Espio murred as they kissed, and upon parting their lips, he made a few final thrusts in order to blow his load into the coyote! As ropes of his hot cum filled her insides, Katie cried out and wrapped her arms around him tightly, letting his head rest on her soft bosom. Espio blushed and nuzzled her from this position. "So... what about that desert you mentioned?" he muttered. Katie chuckled and smirked. "How does round two sound?" she said playfully.


After drinking themselves silly, Amy and Punchy ended up taking the same cab, soon finding themselves at Amy's house. By the time they arrived, they were mostly over their drunkenness, though still a tad buzzed. Punchy shook hands with her, wearing a goofy grin. "You're alright, Ames... And you sure can drink! I never knew you was so f-fun..." he mumbled, slurring his speech just a little. Amy pulled him to the door, leading him into her home. "Y'know... you're a cute idiot. And I need relief with Sonic out of the picture... Help me out?" she offered, giving him a sultry glance.

Soon, Punchy was sitting on the floor of her living room, his cock rapidly hardening as he watched Amy strip for him. He smirked as he saw her nice, mid-sized breasts freed from her bra, her pussy wet with anticipation between her pink-furred legs. He beckoned her to him, and she leaned down in front of him, gripping his cock in her hands and giving it a playful lick. "You wanna cum all over my face, don't you? Let's see how far we get..." she purred. As she licked along his length, Punchy sighed and pet her head in encouragement. "Gonna cum all over you, Ames... Maybe make you forget that blue pincushion..." he smirked. "Not likely..." she replied, "I belong to Sonic... so cum all you like, but stay out of my pussy!" she warned before taking his length into her mouth, her tongue swirling around it as it entered. He moaned softly as her head bobbed up and down over his length. "Ohhh, yeah... Suck me off, you pink...goddess..." he sighed, a bit hesitantly, as though rethinking his word choice before settling on "goddess." Amy stopped upon being called that, looking up at him with a blush. "...No one's ever referred to me THAT way before!" she gasped, smiling at him, "All right... How do you want me, sweet-talker?" she asked. Punchy looked a bit nervous. He barely averted calling her something very different, and for that he was being rewarded? He felt he should still avoid her pussy. "Hands and knees, Ames..." he said, working up a grin. Amy obeyed, presenting her ass to him enthusiastically. "See if you can make me forget Sonic!" she challenged! The green echidna stood up with a smirk. He felt better quickly, and seized her pink-furred rump, plunging his saliva-lubed cock into her tight tail hole! She cried out loudly at the sudden penetration, and soon started moaning as his cock thrusted its way deeper and deeper into her anal passage! Punchy leaned over her, sending his arms around her in order to play with her breasts as his thrusts into her ass made them bounce and swing! Amy panted and moaned, her ass proving surprisingly adaptive to anal penetration. "Ahhh... So, this is what it'd be like for Knuckles to fuck me?" she panted, teasing Punchy. That got him fired up. Punchy pounded her ass hard and fast, growling at her remark. "Knuckles??! Knuckles was at the bar! He had his chance, and he's not here! I'm here!!" he shouted. As Amy's pussy squirted an orgasm, however, she shouted yet another name instead. "Oooohhh... Sonic!!" she yelled, ignoring Punchy's voice completely! Punchy growled louder at this, and with a few more thrusts, he started cumming, but pulled out quickly. He turned Amy onto her back, letting his cum fly over her chest, her breasts, and even a little on her face before he stopped! They both panted, resting a bit. After a moment, Amy winked at him. "If I'm still your goddess... next time you can do my pussy..." she smirked. He looked at her with a perplexed expression, but chuckled softly. "Any time... Seriously. Even now." he said, winking back.


Kosmo had brought Tommy to an abandoned building, one of several hideouts he was using in different cities. Tommy was curious as to how Kosmo would help him "practice" sex, but said little until they arrived at a bedroom, where Kosmo had a king-sized mattress with pink satin sheets covering it. He stood with his mouth agape, and Kosmo smirked. "Don't look shocked yet... I haven't morphed!" he said. "Huh? Morphed...?" Tommy asked. Kosmo's body suddenly started to glow, and instead of a dramatic change in species, he merely altered his normal body's appearance, adding luscious orbs to his chest as his body took on a curvier overall physique. Even the hair on his head grew out more, giving a more feminine look to him. Tommy gasped as the light faded, and a fully female Kosmo stood before him! "Ready? This isn't really practice, kid... It's the real deal..." she said with a smirk. 

Tommy stared nervously for a moment, but then surprised Kosmo by grinning and tackling her onto the bed! "Awesome! I never knew anyone that could turn into a girl before!" he said excitedly, while Kosmo collected herself in time to notice him nuzzling her purple bosom with his cheek. "Yeah... No one else really can..." she said, opening her legs to the yellow porcupine. "So, how do you want me?" she murred. Tommy was getting hard fast, and his mind raced with all the naughty things he'd like to do with Kosmo. He started by lying back, his golden rod pointed up to the roof. "Would you... Ride me?" he asked with an innocent voice. Kosmo expected to be pounced again, but this was okay, too. She brought herself over his inexperienced dick and slowly lowered over it, gradually taking him into her folds. "Mmm... You're big for your age... How old are you?" Kosmo wondered. Ignoring the question, Tommy suddenly pulled Kosmo down, holding her close and jerking his hips upward, attempting to fuck her from below! He kept her close by squeezing her breasts and keeping them in his grip, a sly smirk on his face as he played with his new toys. Kosmo yelped, but smirked back at him, moaning softly as she bucked her hips along with him. "There ya go, little man... Fuck me..." she murred. They kept fucking in this position for a while, moans escaping Kosmo each time the young porcupine gave her breasts a good squeeze. Soon, though, he decided to flip them both over, and after tumbling atop the mattress, Tommy was on top! Kosmo stared up with her glowing yellow eyes and chuckled. "Keep it up, Tom... Don't hold back... Make me yours..." she said lustfully. Tommy lifted up her legs, holding her thighs while he started thrusting rapidly into the morph's pussy! "Ahhh!! Unnnh!! Y-you ARE mine!!" he panted, strangely keeping a small hint of innocence in his expression despite fucking Kosmo like this. She gripped the sheets and moaned as the porcupine kept pounding her pussy. Her tail slid around and up to Tommy's ass, teasing his hole. "I could morph my own dick-tail and REALLY play with you..." she smirked. This line of thinking made Tommy nervous. "J-just the tail, please..." he stammered. He then released her legs and climbed onto her, rubbing her breasts while kissing his gender-swapped lover. Kosmo moaned into the kiss and slid her slim tail slowly into Tommy's tail hole, just giving him a tiny taste of anal sex. Though Tommy wanted to try even more positions, it wasn't long before his inexperienced member felt a sudden tingle, and quickly afterward fired its load into the morph's pussy, making her cry out with a small tinge of disappointment. "Ohhh... Finished so soon?" she sighed as Tommy collapsed on top of her. He blushed and whispered "Thank you...", nuzzling her as he rested. Kosmo nodded and held him, his cock buried in her pussy. "Rest... Maybe I can 'train' you a bit more later..." she said with a smirk.


Sonic and Shadow went into the nearby Eggtopia building. Its technology had long since been deactivated, and it served as a quiet place for them to figure things out without anyone seeing the nude female Sonic. "Based on what I know... I think maybe you had a reaction to the so-called safe sex drug in your system. I know Bucky's up to something." Shadow said. Sonic looked uncertain. "But why only me? ...Is it because I was turned into a girl before? And why now...?" she wondered, considering the possible reason. Shadow nodded. "Yes, you being changed before likely is a factor..." he said, glancing at Sonic and realizing she was blushing, "What is it?" he asked. Sonic shivered, nervous to admit this. "It was the kiss... It turned me on so much... and probably did this to me, somehow..." she said. Shadow stared at her in surprise. "Our kiss? Why with me? Why not with Tails or Knuckles...?" he asked, wanting to hear it from Sonic rather than guess. Sonic stepped close and slid her arms around the dark hedgehog. "Must be... because it's you..." she said, blushing.

This time, Sonic took the initiative to kiss Shadow. As their tongues embraced between their open mouths, the dark hedgehog could feel himself rapidly growing hard, his ultimate member poking Sonic's belly. "Nice... But tell me, Shadow... Were you just in this for that dumb bet, too?" Sonic asked, gently lowering him down to sit on the floor. "Of course... But that's because the winner gets you..." he replied with a smirk. Sonic grinned back, and leaned over his cock, slipping it between her soft breasts. "Oh yeah? Looks like I got YOU right now... Let's see if I wanna keep ya!" she winked, starting to slide her boobs up and down along his length! Shadow smirked and purred softly as his rod was massaged by Sonic's lovely pair. He reached out and gently rubbed her nipples as she kept up the titfuck. "Like 'em, huh, Shadow? ...Don't get too attached, I'm not sure they're permanent." she sighed, giving his cock's head a lick as it poked out from between her cleavage. The dark hedgehog didn't speak as Sonic licked his cock and fucked it with her breasts. However, after enjoying himself for a bit, he patted Sonic's head and let out an impatient "Hmph." Sonic looked up, into his fiery red eyes, and he took her hand in his. "Stand up... I want to take advantage of this form while you've got it..." he said, pinning her against the nearest wall once she was on her feet! Sonic finally looked a tad nervous at this point, but tried not to show it too much. "Right... Hold me down and show me why you’re the ultimate... Faker!" she said, teasing him a little. She wasn't fully prepared for him to immediately obey, though, which was what he did. He held her arms against the wall and roughly pushed his cock through her entrance, knocking down her smug facade and making her gasp loudly! Seeing the nervous look flash across Sonic's green eyes, Shadow proceeded to start thrusting at a gentler pace. "You're the faker... Not even a real woman." he said gruffly, but giving her a gentle smile. Sonic panted a little, and then returned his smile as his cock started to feel good inside her. "Maybe I could be... someday... if you want..." she purred. "That's the vaccine talking... I think." Shadow replied. As Sonic started to moan softly, Shadow sped up his thrusts, eager to prove himself the one true male for her...or him. His hands lowered to her sides, gently stroking her blue fur while his lips dropped to her breasts, licking at her tits as he made love to her. The blue blur's moans grew louder, and she wrapped her arms and legs around her dark lover, keeping him close and petting his soft quills as he made her truly enjoy her female form for the first time! Shadow's thrusts kept going for quite a while, giving Sonic a real taste of why he was the ultimate life form. However, it had to end eventually. "S-sonic... I-I'm...c-cumming!!" he said at last. Sonic clutched him tightly and nodded. "Go on... We can't get pregnant, right?" she panted. "Y-yes, we can!! Ugh, too late!!" Shadow groaned, his seed blasting into Sonic's depths while she cried out his name in her own orgasm! After a few moments of panting, Sonic stared at Shadow in shock. "What do you mean??" she gasped. "The vaccine... I took a sample of it to a lab... Don't ask. But... it's not what Bucky says!" he warned. Sonic growled, and as Shadow pulled out, she suddenly flashed brightly and reverted to her original male form! "...Good, I'm me. I need to have a chat with Bucky, and it's better I'm not his... type." he growled. Shadow nodded. "I'll go, too..." he said.


Meanwhile, a certain feline was entering Bucky's lab at this very moment. "Who are you? What are you doing here??" Bucky stammered. The cat smirked. "Call me Tess... I just wanted to thank you. Your little arousal vaccine has been quite useful to my plans..." she said. Bucky growled softly. "You know? How...? And... what do you want?" he asked. Tess chuckled. "Want? I just want you to know... Sonic changed gender. And now he's on to you." she informed him. Bucky frowned, looking back at the vials containing his vaccine. "So, he did... That was premature. Well, now I'll need a contingency... But why tell me this?" he asked. However, when he turned, Tess was gone. "...Well, thanks anyway..." he murmured.

To be concluded...