Screw just touching; he kisses Louise.

She was right. He wasn't going to last much longer. He could feel his climax inching closer and closer with every swift glide her hand made along his shaft. He looked at her through his pleasure, in that moment forgetting their familial relations, instead only seeing Louise for the gorgeous young woman she was; eighteen years old, standing in front of him with her hand pumping up and down his shaft, her hair flowing around her shoulders as her whole body moved with the process, her beautiful eyes focused on his with intent, her lips open and panting with her movements...

John watched her lips as she masturbated him, watched them panting, watched her cheeky grin spread when she realised he was staring at her, and watched her bite her lip when she felt something he was hoping he hadn't just imagined.

Before he could stop himself, he put his hands on her cheek and neck, pulled her face toward his, and planted his lips on hers.

She resisted a moment, not having expected the action, but as he kept his lips against hers, she reciprocated by slightly parting hers, allowing his tongue to enter and massage hers.

The embrace lasted a number of moments, opening their mouths against each other's, each sibling tasting the other as Louise continued to pump his shaft. Before too long, with his little sister's tongue in his mouth and her hand on his member, he felt his pleasure building to the familiar point of no return.