My stepsister takes advantage of the fact that we had sex the last time to seduce me and have sex with me again

While I am in the quiet room making plans to go out with my girlfriend, my stepbrother gets to talk with me and tell me that other time her new boyfriend was planted on her appointment, she says she is very hot and wanting sex to which she goes to me to repeat What happened days ago ... I tell him that I already have nice but she does not care and to tell everything to my girlfriend ... entered to his room and almost immediately put on 4 and he lets me see his huge ass, it is impossible not to want to penetrate my stepister