Slutty Stepsister takes two dick at once for a first time

My stepsister doesn't know how to behave and when she does herself well you can hear her all over the apartment. I couldn't stand the screams, so I went into her room, and there she was being fucked by a sex machine. I didn't manage to say a word, and she was already giving me a blowjob. I didn't think I would be a participant in her first double penetration!