mom walks into your room and is surprised to see your girlfriend is with you. she is a little annoyed because no one told her that she was coming over. she should always be informed with things like this. with attitude, mom continues with what she was about to do (no one is going to stop her fuck her own son, not even your girlfriend). with your girlfriend still sitting beside you, she shows you her new lingerie she got just for her special son. she keeps getting interrupted by your girlfriend, asking what she is doing, "well showing off for my son of course. did you not know we are super close? and that we fuck?" then mom continues, offering for your girlfriend to stay and watch her boyfriend get fucked by his own mom.