I'm not a twin but do got a older sister that is beautiful and sexy and always dreamed of fucking her. Last year that dream came true. Our mom and dad left to go to work in the morning. Later I woke up and was walking to the kitchen when I heard moaning coming from my parents room. Quietly I opened the door and couldn't believe what I saw. My sister was naked spread out on their bed fingering her pussy. I instantly got hard and decided to drop my boxers and stroke my dick right there in the doorway. She noticed me after a few mins and jumped up covering herself and yelling at me saying "what are you doing weirdo? I'm your sister" "who cares no one ever has to know about this" I said and went over and sat on the bed. "What you think I'm gonna fuck you?" She said I laid back and said " will you please" she didn't say anything just looked at me for a moment. "Your lucky I'm very horny right now bro" she said moving on top of me. I reached up and cupped her big boobs with my hands as she sat on my lap easing my cock inside her wet warm tight pussy. "FUCKKKK" we both moaned. She started bouncing up and down slowly at first. She started riding me faster and harder I had to stop before I came. I then laid her on her back and placed her legs on my shoulders and rammed my pipe back inside that beautiful pussy of hers. I fucked her so hard and good her pussy was squirting like I never seen in any female. "I'm bout to cum" I tell her "no not yet I wanna taste it" she said sliding down to my dick and wrapping her mouth on it just as she started sucking it i came so hard. She swallowed every drop of my cum