A cousin visiting with his parents seduced his sister when she wasn't wearing any underwear.

A guy came to visit his cousin for the weekend, accompanied by his parents. The next morning, while everyone was still asleep, the girl entered his bedroom without wearing any underwear. He was surprised, but it quickly became clear what she wanted from him, and he asked her to show her breasts. She lifted her top and revealed them, then pretended to fall backward, spreading her legs and exposing her bare vagina in front of him.