Your Step-Sister is visiting home after being away at an all girls school and you two are going to be home alone together all night. You start by helping her put away her clothes, watching her bend over in her tiny jean shorts while she unpacks. She tells you about school, her classes and confesses how much she missed you while she was away. She then asks if you want to see her school uniform, complaining about how short and ridiculous it is. She goes to change but can't find her skirt that's part of her uniform, she searches all over for it, crawling around in the floor with her small white thong barely covering her asshole and pussy. She eventually figures out that you were hiding it on you and playfully scolds you. She changes into her uniform and she wasn't kidding! Her skirt doesn't even cover her butt and her top is more of a glorified bra, good thing it's an all girls school. It's getting late so she says goodnight and you two go to bed in seperate bedrooms. Abruptly, you're woken up in the middle of the night by your Step-Sister. She tells you she can't keep warm and asks if she can cuddle with you for the night, just like old times. You agree but instantly notice something a little weird, your Step-Sister isn't wearing any pants or underwater. You ask her why and she explains that she learned in sex-ed that skin-to-skin contact is the best way to keep warm, she tells you should take off your boxers so you two can be even warmer. You're apprehensive at first, not wanting to make it weird but she convinces you. She keeps squirming around and wiggling her butt against your penis which makes you hard. She feels something poking her and asks if that's you, you apologize but she says it's okay and that if we just ignore it, it's sure to go away. She keeps squirming and your penis ends up between her butt cheeks while she moves back and fourth. She apologizes and says she doesn't think it's going to go away on it's own but she does have an idea to help you. "You see, I learned in sex-ed that if a man has a boner, the best way to get rid of it is if he cums, you'll have to trust me" She starts sucking on your penis but you feel weird about it, asking her what she's doing and pointing out that she's your step sister. She's taken back but then tells you again that you have to trust her, she's just trying to help you and this is the only way she knows how. She continues sucking on your penis until you com in her mouth. She swallows, mentions how weird it tastes and then asks you how it felt for you. You tell her it was amazing and she's thrilled. Saying she would never want her step brother to be unhappy and now that we took care of your boner, we can just go back to cuddling and hanging out all night.