You give Audrey a break.

She can barely keep her eyes open. You decide to help the guys out a little. You quietly step out of the room and head toward Josh's room. You retrieve some lube from his room, sometimes Josh likes to fuck you up the ass. You head back to the living room. Audrey is slowly fingering herself and feeling up her boobs with her eyes closed. "damn I really did turn her into a slut. She just doesn't stop" You think to yourself. Josh and Tim were still going at it. Josh is on top of Tim sucking his dick, while Tim did the same to Josh's. You walk over in front of Josh, and he stops sucking and looks up at you. You show him the lube. He grins widely. "Why'd you stop?" Tim asks, while still blowing Josh. "My boyfriend wants to fuck you in the ass while you fuck my pussy." You blert out before Josh has a chance to speak. Josh now climbs off of Tim. "Fuck yes!" Tim says. You can see that he has a little cum on his chin, looks like Josh gave him a little birthday gift. You waste no time. You hand the lube to Josh and you get on your hands in knees in front of Tim. He moves over and straddles you. He slowly inserts his member into your pussy. You are still dripping wet, even after all of this fucking. He is bigger than Josh, you can feel it. Josh lubes up his dick and gets on his knees behind Tim. Tim stops thrusting into you for moment as Josh slowly inserts himself into Tim's asshole. He is moaning more than Audrey did. He starts thrusting back into you. Tim is now slowly bouncing off of your boyfriend's dick and into your pussy. Tim can't handle the pleasure and cums inside you after only a few thrusts. Josh pulls out of Tim and lets Tim pull out of you. His seeds drips out of your pussy. Tim falls over onto the floor from exhaustion. "Best birthday ever!" He says. "Come here Josh lemme finish you off." You say to your boyfriend who seems upset he didn't get to fuck Tim for very long. He suddenly slam his cock into your cum filled pussy. And he fucks you, HARD! You are screaming with pleasure. He is grabbing your hair and fucking you like the animal you are. You climax twice, and finally he pulls out and shoots his load all over your back. You are both exhausted at this point. He lies down on the floor as well and rests. You take in the scene of it all. You see Audrey on the couch asleep with a huge smile on her face, her face and tits covered with cum. You see Tim has made it to the other couch he too is asleep. You crawl over to your naked boyfriend and you give him a long kiss. "Sleep now sweety, you earned it." he puts his arm around you and you both fall asleep on the floor.

*One of many endings, restart the story to see the others*