Your sister calls you into her room and asks if you can do her a favor. She recently bought some new lingerie sets to surprise her boyfriend with, but she needs a second opinion to help decide which one is best. She asks if maybe she can try it on for you and you can let her know what you think since she can't really ask any other guys because she has a boyfriend, but since you are her brother it won't be a problem. You agree because you want to help your sister out, and secretly you thing she's really hot so you won't pass up this opportunity to see her in lingerie obviously. She tries on 4 sets for you and you can't believe how sexy she looks, and she ends up noticing you are hard! She calls you out on it and teases you about it playfully as she dances around and shakes her ass in a tiny thong. She ends up convincing you that it would be ok for her to give you a BJ, not like its a big deal or anything. Eventually after sucking your cock for a few minutes she wants more, and asks you to please have sex with her and fill her pussy up, which you waste absolutely no time agreeing to. After some riding you fill her up with a huge load.