>>596062The blindfolded guy was sleeping on the floor in his sisters apartment. He probably lost his job and had to move in with her because he couldn't afford his rent. His sisters boyfriend came over to bang her. The brother and sister decided to blindfold themselves to avoid the awkwardness of such a situation. At this point the boyfriend called his friends over to play an epic prank on his girlfriend. Since the brother and sister are both blindfolded, the boyfriend and his friends are pranking them into having sex by tricking the sister into thinking that her brother is her boyfriend. It's a classic norm gag.