[MMF] boyfriend ties me up on the bed and his roommate comes in and fucks me

Its been several days since i finally told my boyfriend about my fantasy about me being dominated. I was thrilled because we were gonna do it today.

We were in his apartment. We were alone. He lives with his friends but they were out. I was so turned on when he tied me to his bed to a doggy-position, but i didnt show it to him. I tried to crawl away. I begged him to let me go. My both hands and feet were tied and i couldnt move.

He puts it in and starts fucking me. “No, please not this way”, i beg. I try to get off from the ties. “Theres nothing you can do”, he says. And i knew its true. So hot. (I didnt get in to the details in this part because that was not the point of the story)

Then it happens. Someone bursts into the room. The door wasnt locked. Fuck. He comes to the bed and i recognice him. Its one of my boyfriends buddys. My boyfriend stops fucking me and yells “what the fuck man?” He just stares at me, at my little asshole, and i cant do anything. I cant move or cover myself. I feel shamed. My boyfriend just attacks him and punches him in the face. They fight on the floor.