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Description
Kathie awoke one morning, next to her sister, Amber, not wanting to wake up. However, she noticed something was very odd-- She got up and walked to the bathroom, before noticing she, was now infact a he. Male parts and all. He held in a scream, not wanting to wake up his sibling.

Amber rolled over on her side with a soft groan and noticed Kathie had awoken. She got up, walked to the bathroom and knocked on the door. "Kathie?" She asked. She blinked noticing her voice was a little deeper than normal.

"Y-yeah?" He called out, before covering his mouth. Yep, he was the opposite gender. He had no idea how it could've happened. "C-can I come in? Something doesn't seem right," He mumbled, hoping Dipper or the others wouldn't see him as a male. Kevin opened the door reluctantly. "You're going through t-the same thing too, huh?" He mumbled. Aside from waking up as a male, something else felt... weird. He couldn't quite put his finger on it, but his breathing was heavier than normal.

Aaron nodded "Y-yeah, it feels a little odd to be honest with you," he said, laughing. He looked at Kevin. "Are you alright?" He asked as his ears flattened down. "Yeah," he lied. There was an unboding feeling in him that he couldn't figure out. "We should probably tell the others..."

Aaron blinked. "S-sure..." He said nervously. He walked of the bathroom looking for Dipper and Mabel. Dipper was sitting on the couch watching TV along with Mabel. Kevin walked into the livingroom, Mabel turning around just in time to see him. "Hey Kathi-" She paused. "What happened to you?"

Aaron was behind him and blinked. Dipper turned around as well seeing Aaron behind Kevin, "A-Amber-?" He asked, confused. Aaron chuckled nervously. "I have no idea how this happened... it also happened to Kathie which is now Kevin," He said.

Kevin stopped, frozen. There was a sudden rush of a foreign feeling he's never known. He ran to the room he and Amb- Aaron, slept in, and went to the nearest bathroom, shutting and locking the door.

"Where'd he go?" Mabel questioned. Aaron blinked. "I don't know... M-Maybe I should go and check on him," he said, running to the bedroom. Dipper blinked and looked at Mabel in confusion.

Kevin laid there, his back against the wall, panting, ears flattened, and his tail perfectly still behind him. He didn't know what was wrong, or what to do. All he knew was that it'd probably be bad for someone to see him like this. Aaron knocked on the door, worried. "Kevin are you okay?" he asked as his ears flattened, worried about his brother.

Aaron then thought of something, digging into his pocket and getting a card out, putting in the door. He opened the door with the card. "What's wrong?" He asked as he walked in, closing the door a bit worried as he sat on the bed.

"I... don't know," he admitted between uneven breaths, a tent visible in his shorts. His tail began moving behind him, and his reactions seemed more from instincts than thinking clearly, as he had to force himself not to pounce on his sibling right then and there. Aaron blinked and looked at him confused, "Kevin?" He asked looking down at him, holding his hand without knowing it.

Within almost a second, Kevin had pinned Aaron down, faster than even he could acknowledge. There was some sort of emotion hidden behind his gaze, but yet, it was almost impossible to identify. Aaron blinked and his eyes widened. "K-Kevin...?" He asked, slightly confused at his brother's actions and looked into his gaze. "Are you feeling okay, bro?" He asked, concerned

"N-no," he stammered, mumbling an apology under his breath before flipping Aaron onto his stomach. Aaron looked at him and blinked as he started to get a little nervous. "K-Kevin....?" He said, blinking, and his ears were flattened, scared and nervous about what his brother was doing.

Kevin pulled his brother onto his knees, facing the opposite way before pulling his brother's pants down. He wasn't thinking right, and had no justifiable answer for why he was doing the things he was. Aaron blinked and blushed deeply, thinking on what his brother was doing. "K-Kevin?" He asked quietly, questioning his brother's actions.

Kevin reached a hand up to stroke his brother's newfound length, pushing a digit into him with his other hand. He refused to talk, but, then again, there was nothing to say. Aaron shivered and closed his eyes, moaning. "K-Kevin..." He said, gripping on the bed sheets.

With no urging for him to stop, Kevin stroked faster and pushed two digits in instead, pumping them in and out. Aaron moaned louder, hoping none of the others would hear his moans, his tail swaying a bit. "K-Kevin..." He said between another moan.

Kevin lowered Aaron's hips down, pulling his shorts down. There was no need for lubrication and or preparation, however, because being in heat took care of that. He entered Aaron slowly, not wanting to cause any pain. The quicker they could get it over with, the better. Aaron panted and looked at Kevin. He was a little bit nervous due to being like this with his brother. His ears flattened back down. "K-Kevin....Are you okay?" He asked nervously.

"I will be, soon," Kevin replied as calmly as he could manage through pants, before thrusting deep into Aaron. Aaron moaned loudly, gripping on the bed sheets. Kevin continued at the same depth, but went faster and faster, his climax nearing. Aaron ears perked up and he let out a soft purr.

With one last thrust, Kevin came inside of his younger sibling. Finally, the feeling he couldn't bare to have had gone away. Aaron panted and looked at Kevin, softly licking his face with a blush.

"Sorry," Kevin mumbled, laying down next to Aaron. He hugged Aaron close to him. Aaron shook his head and kissed him. "No need to be sorry~" He said. Dipper got up from the couch. "I'm gonna see if Aaron and Kevin are okay," he said to Mabel, walking towards their room. He slowly opened the door and blinked, his eye twitching. "U-Uh... Am I interrupting something..." He mumbled.

Within a second, a very inappropriate remark had left Kevin's mouth without a thought. "Nope, just trying out the new package I got." Upon realizing what he said, a very believable smirk carved into his facial expression.

Dipper blinked and nodded. "O-Okay t-then..." He said as he turned around. Aaron sat there and blinked.

"H-hey.."

Aaron looked at him. "Yes?" He asked softly.

"Wanna do a round two..?"