She slipped a hand inside her panties to find they were a lot wetter than she'd expected. She stifled a moan as she started to rub her clit. She'd have to remember to stay quiet. She wouldn't want to wake her brother up and have him find her touching herself. That would be wrong. The idea of it sent her arousal to new heights.

Of course, if he did wake up, she could just stop moving and that wouldn't betray anything. She wasn't even naked or anything. Imagine if he woke up to find his naked sister masturbating next to him. The thought made her moan loudly again. She covered...