My sister-in-law's one-piece dress is too erotic, and I feel awkward so I try not to look. But my sister-in-law seems to have noticed and instead finds it amusing, showing off even more. Even when I'm studying, she brings me snacks and shows off every time, making it impossible for me to concentrate on my studies and I end up getting an erection! Of course, I can't hide the erection, and it gets noticed. Thinking I'd be rejected, but she seems to have been waiting for this moment, locking onto my dick! Could it be that my sister-in-law had planned all of this? Even the see-through underwear and nipple slips.
