My gf is speaking about her guy friend

My gf was coming back from the beach with her friends. She was in her bikini. She was telling me about her day, while I was all over her, touching and carresing her. At some point she mention the fact that she never realised one of her friend was that tall and muscular. She started telling me that they talked a lot about his muscle, that he let her touch them. I was starting to get angry so i bended her over the table. I was very hard in jogging against her ass. She then admit that when he put sun cream on her back she felt his cock against her ass, apparently it wasn't hard but bigger than mine. I pulled out my cock, pull aside her bikini and start fucking her roughly. She turned her head face to me and said she wished I was as big as him. I pressed her head on the table. Telling her to shut up. She laughed telling that she would have obey if I had his muscle. Still pressing her head I started slaping her ass. Treating her of whore. She asked if I was thinking he was stroking to her in her bikini. And I cummed in her. She laughed again saying that she bet he would hold on longer than me.