Little sis needs to talk to her wise and comforting big brother. She's too embarrassed to talk to mom about it so she decides to talk to you. She confesses that she has been having sex with her boyfriend for about a year now, and after hearing some girls at school talking about having orgasms realizes she hasn't experienced one. She's worried she can't have an orgasm and asks you. her understanding big brother, if you'd be willing to help her experience one. Of course you agree. How could you resist your slutty little sis, especially in her new school uniform. You couldn't have said no even if you wanted to. Your cock got rock hard just listening to sis talking about fucking her boyfriend. She lifts her skirt and shows you her pussy. "what do you think big brother? Does my pussy look good to you?" She teases and shows off her little holes to you. "Want to try my pussy out now big brother?" You enter her slowly as your cock is much larger than her boyfriends. She can barely take you in at first so you have to be slow and gentle as you slide your cock into little sissy's tight little cunt! "But big brother I'm not on birth control, shouldn't you wear a condom?" You know you should but you have just used your last condom on your girlfriend, but you can't miss this opportunity to fuck your sister so you assure little sis that you'll pull out. She agrees and you being to fuck her! Slow at first but continuously working your cock into her pussy harder and faster. She nearly orgasms instantly as you enter her bareback! "Wow I guess all I needed was big brother's bare back cock inside me to have an orgasm!" You continue to give little sis your cock, satisfied that you've made her orgasm so quickly! Sissy's pussy feels so good wrapped around your cock. You know you were suppose to pull out, but her pussy is so good. You can't imagine pulling out until finished with her. So you go back on your word and fill little sis with a massive creampie