The waning sunlight poured into the window and onto Isabelle’s desk, illuminating the stacks paperwork before her. The sun-yellow dog sighed softly as she looked away from her work and out the window to the world outside. It was dusk and the sun was just starting to crest under the horizon, beneath falling yellow, orange, and red leaves. The ever-falling glowing orb showed Isabelle what she had already feared. “Not enough hours in a day.” she muttered to herself. Isabelle stood from her desk, beginning to organize her remaining paperwork when a knock came from the door. She glanced out the window one last time. Odd, she thought to herself, who might that be at this hour?
        The Mayoral Secretary dusted off her clothes, approaching the door. She opened it with a smile as she began her usual work greetings. “New Leaf town hall, how may I help you-” On the other side she saw a familiar brown dog in blue slacks, an unbuttoned red blazer, and a loosened yellow tie. “-Digby!” Isabelle hugged her brother tightly as their tails wagged excitedly. “It’s been so long, it’s so good to see you!” The brown mutt smiled and returned her hug. “Hey Issy,” he replied, “Missed you too.”
        Isabelle lightly whiffed the air then pulled back from the embrace. Her face was stern and her brow furrowed. “Digby, have you been drinking again,” she pushed his chest playfully as her smile returned “without me? How could you!” As she giggled, his smile faded slightly. “Is it that obvious?” He chuckled softly. “Either way; yes and I have something I want to talk to you about.” 
        That caught Isabelle off guard. “Oh, sure! We can just talk here in the hall; it’s closing time anyway and I have to finish organizing some paperwork. It’s private and we can talk while I work.” Digby nodded, his smile returning. “Sounds like a plan!” The gold dog ushered her brother inside and switched the sign outside from open to closed before shutting the door. Digby strolled into the center of the room, letting his eyes wander around the offices as Isabelle shuffled past him to the front of her desk. 
Isabelle spoke as she passed her brother. “The Mayor authorized construction for a new fountain in the center of town. I think it’s a really romantic spot!” Her brother nodded “You’ll have to show it to me” She nodded while beginning to shuffle through the papers upside-down. “...So,” she started, “what did you want to talk about?”
        Eventually Digby’s eyes fell on his sister. “Well, uh…” He saw her supple form, bent over the desk and shuffling papers away, her spine arched while her butt was pushed out towards him. His wandering eyes traveled up her legs to her skirt where her tail waved softly from side to side just above. He could just barely peek at the pink panties treasure it’s guarding underneath. He swallowed as he tugged at his shirt collar. Digby’s face was flushed from the thoughts he’s having of his twin. 
He inhaled the cold fall air, hoping to cool himself off as he averted his gaze. “...You see, I uh…” Isabelle didn’t look up, just replied mhmm as she waited for a response. He exhaled, closed his eyes, took two steps forward, and finally spoke after a long pause. “Isabelle… I love you.” His sister giggled, not looking up from her work. “Was that all? Of course, I love you too!” 
He took another step, now in her personal bubble. “No, Issy; I– Gah!” He looked down, grunting frustratedly, as he tried to think of the words to convey his meaning. Isabelle finally turned around. She was confused. She had never seen this side of Digby before. ”Issy, I love you! I love you, love you!” He reached up and caressed her cheeks. “The kind of love where I want to be with you, forever!” He leaned in, his face inching closer. “I want to hold you… To kiss you… to show you how much I truly, deeply, love you….”
Isabelle's mind was racing while he spoke. Her eyes darted from object to object. Her face, blushing brightly. She couldn’t think straight. 
        Instinctively, she reached up and lightly held his wrists. Is this really happening? She thought. It can’t be, right? He’s got to be joking! 
She had never thought of him like that before tonight. But maybe it made sense? She does love him and she is feeling something right now… but what is that feeling?
Digby paused his decent mere inches from Isabelle’s face, which caused her eyes to finally settle on his. They looked into each other's eyes for only a moment. Then Digby made his move. He closed the gap, pressing his lips to hers.
He closed his eyes as he kissed her. Isabelle tried to fight the instinct to kiss back. It felt… good. Right, in a way. Her tail started wagging furiously as she tried to resist.
Her entire life she never thought of her brother in a different way. She never thought of the affection he showed her as anything more than what brothers do for their sisters. But on reflection, it did always make her feel… warm somehow. Fuzzy and light headed, but not in a bad way. Perhaps she was even happy to receive her brother’s affection. Should this be any different? Sure; it’s taboo, but… fuck it! In a split second decision, her eyes closed and her hands glided up Digby’s arms, hugging him around his neck.
Digby’s breathing started to hasten. His hands roamed down his sister’s back, down to her ass. Suddenly; he leaned down and quickly picked Isabelle up by her thighs before pushing her back onto the desk. Again she was caught off guard, gasping into the kiss. Her papers, her nameplate, and her favorite mug scattered onto the floor to make room for her.
“Ugh, Digby!” She said with a coy smile, “Look at the mess you made, it's going to take me ages to reorganize everything!” She giggled softly while she spread her legs to make more room for her brother. Digby looked around at the scattered papers, blushing from embarrassment. “Sorry… I, uh… Um…” 
Isabelle grabbed his tie and pulled him into another kiss, this one more heated and passionate. Her tongue pushed its way into her twin’s mouth and he returned the gesture, their tongues rubbing, locking, and dancing together in their mouths. 
By the time Digby pulled away, a trail of saliva connected their tongues from their agape mouths. They were panting heavily as they gazed longingly at each other. The time was right. The mood was set. But they realized there was one final barrier.
In an instant they began to nearly rip their clothes off. Isabelle quickly pulled off her sweater and shirt, tossing them away as she yanked down her skirt. She revealed her pink panties and bra. Unfastening her bra and throwing it off letting her titties bounce free before nearly tearing her panties away to reveal her glistening pussy underneath, already wet in anticipation.  
All the while, Digby threw off his blazer, kicked off his loafers, and unbuckled his belt. He let his pants slide down before kicking them away. The final obstacle was his boxers, which he ripped down to his ankles before stepping out of them. He stroked his already rock-hard cock as he got into position. The tip was already leaking pre as he aligned himself to his sister’s entrance, her tantalizing honeypot enticing him to thrust in.
In a moment of clarity through the bliss though, Isabelle stopped him. “W-Wait! I-I’m not ready to get pregnant yet, and I-I don’t have any condoms on me…”  Digby froze, his tip poking against his twin sister’s hole that he so desperately wants to take for himself. His member twitched against her pink, wet folds. “Damn… Neither do I….”
He knew his pull out game was weak. If he did thrust in, there may not be any pulling out. That’s a risk he didn’t want to take while he was still thinking clearly. He didn’t want to go against Issy’s wishes either, but damn did he really want this. She did too, by the looks of things. Then, he got an idea; a way then can both satisfy themselves tonight and he can prove his love without having to worry about his weak pullout game. 
Digby was stroking himself to keep his schlong extended as a grin came across his face. “Hey Issy,” he said while licking a finger, “what about here?” His finger slipped under her muff and right to her backdoor, where it slid right on in. Isabelle gasped as he pumped his finger in and out of her ass. “Hmm, I think I’d like that~” She smiled at her brother.
“First thing’s first…” Digby said, leaning in close, “...Gotta lube up!” He pressed his cock into Isabelle’s juicy pussy. She moaned out “Ah!~ Digby!~” Her brother’s ears twitched and his heart raced as his twin called out his name. Her warm, wet walls were so inviting, it was almost maddening that he couldn’t pump her full right now! So he took the invitation to hilt her, pressing his shaft in deep till there was no space between their crotches. Digby moaned softly as he leaned in and kissed Isabelle, pumping in a few slow complementary thrusts to make sure his member was nice and wet for the ride they were about to share. 
Isabelle felt wonderful with Digby inside her, she almost didn’t want the feeling to end! Her walls tightened and rippled around her brother’s shaft in an involuntary attempt to keep him inside. It didn’t work quite as intended. Digby started to pull out as Issy groaned in a mix of disappointment and pleasure. Finally, Digby pulled himself out with a slight ‘pop’. Issy knew what it meant though, so she rolled her hips to give her twin unrestricted access to her backdoor. Then Digby aligned his tip and pressed it against her pucker. He gasped as he felt how tight the entrance was. “Ready, love?”
Isabelle nodded and that was all the go-ahead Digby needed. He pressed his dick into her tight ass, feeling the walls squirm and squeeze his shaft. It was blissful for him. Issy was panting for more as she started to rub her cunny, ready to be fucked and have her ass bred by her twin brother. Digby was about halfway in when he started to thrust. The sudden movements sent a shiver up Isabelle’s spine. He started off slow, pacing himself as he methodically fucked his sister’s butt. Digby moaned between his breaths, in pure carnal ecstasy. Isabelle was enjoying herself as well, enjoying the quality alone time with someone she loved so much.
Digby started to pick up speed, thrusting harder, deeper, and faster into Isabelle’s anus. He huffed as leaned down to kiss Isabelle again, pumping his lubed up cock deep into her bowels. She moaned into the kiss, pure euphoria coming from in between her lips. Her brother plowing her insides deep, hilting her ass with every plap. But he wasn’t at speed yet, he knew he could go faster! Issy fingered herself furiously, groping her own breasts while Digby fucker her.
He leaned over, bracing himself on the desk as he pumped his sister’s ass as fast as he could. Railing her insides hard, he moaned “Mmm, Issy! Your butt feels so good!~” . Then he was panting fast, indicating what was coming next. Issy moaned out for more, locking her legs around Digby’s back. He was afraid that might happen, it was a good thing that pulling out didn’t matter here! He was already close, on the edge, and that’s when he heard it. Isabelle cried out “Cum inside me, little brother!~” Issy clenched down as she started to cum, her walls tightening even more around her brother's battered member. 
It pushed him over. He couldn’t hold it in after that. He thrusted his cock as deep as it could go, then spurted his seed. He managed to squeeze in a few more thrusts as he came. Rope after rope of semen painted his sister’s insides a milky white. Then, with a sigh, he collapsed on top of her. A panting, exhausted mess. Isabelle was panting hard, exhausted as well. When her brother fell on top of her, she hugged him tightly. Holding him there close to her. She kissed his cheek. “I love you Digby!”. He hugged her back. “I love you too, Issy!”
They made room for each other by knocking free everything else that was in their way on their makeshift bed for the night. Then they laid there on the desk, cuddling and spooning in the moonlight for some time. Just enjoying each other's company. Sharing small kisses and caresses with each other as time flew by them. Isabelle hadn’t felt this satisfied in a while and she definitely felt she needed the stress relief lately. With a content and happy sigh, she snuggled up closer to her brother.
“Want to go another round?”
        “Yes, please!~”