I'm dressed as a teacher, on a phone call with my friend, I tell her that I want to surprise my boyfriend who is coming back from a trip, I want to lose my ass virginity to him, and I'm very anxious, he's going to come here to my house without my parents and my stepbrother knowing, I also tell him that I just finished teaching a class so I have to get ready for when he arrives and I hang up the phone. I look back and see my brother staring at me, I'm disconcerted but I don't think he notices and I ask him what he's doing here, and he wants to tell our parents and so I ask him if it can be our secret, and then he tells me that only on one condition, if he eats my ass first, I can't believe this is happening because I'm his sister, how can he want this? But he reminds me that I'm his half sister, and it's either that or tell our parents, and I understand that we're half brothers and I end up accepting the proposal, and I start by taking off his pants and sucking his cock (OMG his cock is so big and thick) and then I take off my clothes, he still plays with my ass a little, slaps it, I pretend he's going to stick his cock in my ass and first he sticks it in my pussy and it's so good and I get so excited that we soon go to anal, I start slowly and I feel his big, thick cock enter my ass and it's so good and pleasurable, we do it in three different positions and in the last position he fucks me without mercy, my god, how hot and then he cums all over my face and I swallow and still smile because I can't believe what we did.