You are just making dinner when you overhear your little sister in her room. She's wearing only a towel, just out of the shower, putting lotion on her sexy legs... you're already a little hard for her hot body. She hangs up the phone, and tells you she know you're there, and invites you in. It turns out, she was just bemoaning how she doesn't know ANYTHING about sucking dick! She's never even had sex. Being the sweet, caring older brother you are, you offer to help her learn a little something about giving head... and, if you get lucky, about taking cum in her mouth.