Shy flatmate gets involved

I had picked up a guy and taken him home with me. As I'm lying in bed with him and we're just about to start stroking each other, my shy flatmate stands in the bedroom, irritated, and flees again. I bring her back and invite her to have fun with us. So we take it in turns to blow my conquest and let him fuck us really nicely. She's probably not as shy as she acts.