She thought I was Her Boyfriend! Came Inside Her

She was waiting for her boyfriend to come back home, and she wanted to be fucked right away. So, she got her butt and pussy ready for the action: she was in doggystyle in the bedroom. She noticed that cock feels bigger than usually and then she realized, it was not her boyfriend! His roommate arrived a bit earlier than expected. She did not want to cheat but he was already fucking her, so what is the point now? He can't handle himself and cums inside her.