I was chillin in the back with my friend having some beers. He had to leave but my sister was friends with his sister but his sister wanted to stay for a sleepover. Then she told my sister she would call her brother to pick her up. She went to the back and forgot her phone inside. I was just chill on a chair. She came up to me and said hi. I thought she was hot af. She had big boobs a big butt. Then she put me to the floor and started grinding on me. She then unzipped my pants and sucked my dick. I then took off my pants and boxers. She took off her shirt bra pants and panties. We went in a little shack thst my dad used for storing stuff. I then put my dick in her vagina. I cummed in it alot too. We fucked until almost the morning.