Your bitchy sister is such a slut! She invited you to come with her to a party tonight but it wasn't out of kindness, she just wanted a ride back home because she knows she's gonna driink too much. By the time you get there she's already 10 deep and chugging down more from red solo cups and shot glasses. She teases you because she knows you won't go up and talk to anyone. When your sister has finally made enough of a fool of herself you gladly take her back. You know she was teasing you in the tight fitting little outfit and if she shows off why not look? Fortunately for you she passes right out in your bed tonight SCORE. Since she's snoring she won't mind if you take a peek right? It makes you so hard fondling her breast that you have to stroke a little. You rub the tip against her mouth and unsnap her outfits crotch. God it makes you so horny you can't help yourself you have to get your dick a little wet. You pump her and empty your balls inside of your sleepy sister in no time at all... but she's not out for long. The good part is she isn't even mad... she wanted this all along.