The two of them come into the room. Apparently the older sister had a fight with her husband and ran out. This happens all the time, so the younger brother seems used to it. When he offers her permission to use the bed, the older sister fidgets in the futon, taking off her skirt and removing her bra, and getting ready for bed. She teases her brother and enjoys his reaction. After a while, the older sister is fast asleep. The younger brother is playing with his cell phone. The older sister turns over in her sleep and the futon comes undone. The younger brother tries to cover her with the futon, saying "what the heck," but the older sister turns over again. Her panties are completely visible, and her nipples are clearly visible, right in front of him. The younger brother, seeing her adult body, can't help but stare at his older sister. Before he knows it, the younger brother is standing and touching his crotch. The older sister turns over in her sleep, occasionally making sexy noises. The younger brother brings his face close to his older sister's crotch and strokes his penis. The older sister turns over in her sleep, and ends up with her face between her legs, which wakes her up with a start. In front of her is her brother clutching his erect penis. "Wh, what?" The sister is surprisingly shaken. The brother comes to his senses and tries to pull up his pants. "What are you doing? I can't believe it. We're brother and sister, aren't we?" But the sister is starting to feel sorry for her brother and wonders if he's been building up a lot of energy. She says, "Come here," and says she'll help him cum, and starts giving him a handjob. She stares at her brother as she gives him a handjob. She starts licking his penis without saying a word. The erotic blowjob continues. She seems to be getting excited, so she makes him lick her crotch. The brother slowly licks her sister's pussy. The sister is getting aroused. The sister holds her brother's hand and says, "Put your finger in." The brother slowly puts his finger in her pussy, licking her clit as he moves it in and out. The sister gets aroused and cums. The older sister lays her younger brother down and says, "We're siblings, so I can't put it in, but I can just rub it, so you can cum with that." Then she starts riding him. The older sister shakes her hips violently. He ends up inserting it. "No, I'm telling you not to." However, it seems to have felt better than she expected, as she continues to move her hips. The younger brother cums inside her, and she says, "Hey, what are you doing!"