Let my little sister’s bf fill me up [FM]

I was visiting my family this weekend and my little sister still lives at home. She's around 20 and she has a boyfriend who is a bit older (maybe like 22, 23). Her boyfriend, was very appealing. He's a swimmer or something so has a lot of lean muscle and he was really tall so I knew he had to be hung. I had these little thoughts, ones you keep to yourself because it's inappropriate to say out loud.

I had never met him before and we hit it off right away. He was very charming and had a nice laugh. However, my sister treated him like garbage. She was constantly interrupting his stories and inserting ones of her own and downplaying his achievements. Evidently he's a pretty damn good swimmer but you wouldn't know it from the way she was talking about him IN FRONT OF HIM.

By the second night of staying there I had just about enough of my sister. It was clear her words were dragging him down and his cheerful charming self was slowly retreating. So that afternoon, my mom took my sister to do some shopping for her job and I made my move. I went into their room they were sharing and he was just listening to music. I sat on the edge and I apologized for my sister's behavior. He admitted that he thought it would not probably work out and this was his last chance for her to change. Said that he was tired of her, and she had disappointed him once again.

I asked if anyone was waiting in line to pick up him once she left her and he laughed and said no. I leaned forward and asked if he wanted there to be someone.

His whole expression changed and it was clear he was into me but had been hiding it. I climbed on top of him and kissed him, our tongues sliding into one another's mouths and tasting each other. He bucked his hips against me, grinding against my clothed pussy with his hard on stuck in his pants.

We tore out clothes off and he pushed me into the mattress. And there in my sister's childhood bed, he sank his giant cock inside of me. It was so big I thought it wouldn't fit but once his pink mushroom shaped head slipped in I knew I could take him. He slide inside of me until I had taken ever inch of his cock and his balls were pressed to my asshole. He fucked my like no one ever had. His cock was so delicious, and hit every single part of me that I needed to be touched. He left bite marks on my neck as he pumped his meat into me. Then, with nothing between us, he came inside of me. It felt so good to take his semen especially knowing it was in my sister's bed, in her room, and with her bf's cock.

I had to waddle back to my room, my pussy dripping with his cum, when we heard the door slam announcing they were home. I knew, as I cleaned myself up, that I could not go on with my life without riding that monster cock again. We had dinner and she was pulling her same bullshit putting him down but he was looking at me the whole time. He has such a delicious mouth, I'm thinking of riding that next.