Unexpected BBG Threesome

While in bed with my BF, he insists on doing a threesome with another girl and me. We've talked about it a couple of times, although we never did it. Now he keeps bringing up this topic almost every week! To please him, once and for all, I agreed to do it. He grabs his phone and searches on a site for someone to join us. We pick Rosario, we are so turned on! When it's time to open the door, we are both surprised to find a guy named Rosario ready to join my boyfriend and me for a fuck.