It had been a week since Mysterion last spoke to Karen. He thought about how his cock felt in her tight pussy, his mind fuzzy with pleasure, his cum drooling down her thighs.
Mysterion swallowed hard from the roof of the McCormick house. He knew it was wrong, but every time he thought of the situation, his cock ached with excitement. He needed to feel that pleasure again.
"I really love you, Mysterion… You can fuck me anytime you want."
Mysterion swallowed his hesitations and slid down into the window of Karen. He would not allow the opportunity to get laid disappear.
He unlatched the window and slid inside. Karen was already asleep, from what he could see. He mentally cursed the odds of her having fallen asleep on her own for once. Mysterion crept over to his sister and examined her sleeping body. She was dressed in skimpy pajama shorts and a tank top, as the nights were often humid. Mysterion laid a hand on her thigh and found she radiated heat. When Karen did not wake up, he continued. Mysterion slid his hand up Karen's thigh, and into her shorts. Her curled up body made it difficult to navigate her skin.
He groped her hips and made his way under her shorts. She stirred in her sleep but did not awaken. Mysterion watched her sleeping expression- his cock throbbing harder with every touch.
He wanted nothing more than to fuck her, right then and there, but he forced himself to hold back on ravaging his younger sister.
Mysterion moved his hands to pull her tank top over her body, exposing her small breasts. He cupped one of them roughly and licked his lips hungrily. Even in the dark, he could see her sensitive nipples growing harder. Mysterion leaned in and pressed his lips against a bud. He swiped his tongue over it, and sucked on it. He fondled the other breast with his hand and pinched the other nipple.
In her sleep, Karen stirred and whined a bit. He did not hesitate to bite down, lightly, on a bud. He retreated, still with the nipple between his teeth, and tugged. Mysterion did this a few more times before releasing the nipple. It showed an irritated red, with light bite marks on her skin.
"Mysterion?" Karen asked groggily and wiped the sleep from her eyes. "What's going on?"
Kenny smiled at her cuteness. He moved his hand up and stroked her hair.
"Karen, I can't stop thinking about your body. Let me feel good with you?" He asked.
Karen was quiet for a few moments before slowly nodding. She leaned back on the bed and bit her lip. "Come here."
Kenny obeyed quickly to lean down and kiss her. Their lips moved together for a good while before Kenny moved retracted. He pushed his lips up against her neck and moved down. With his hands he grabbed her breasts and fondled them. Karen squeaked before covering her mouth.
"Mysterion... More. Please," She begged.