Wait outside until they're both nude and hot at it, then go in naked and take the whichever end of Shayla is available.

You're certain Adam would be willing. Shayla's a slut and horny. You peek in the room and see Shayla already completely naked sucking Adam's cock.

You decide not to waste precious time. Kara;'s waiting for you after-all. You could fuck them both tonight.

You strip in the hall and walk in.

Adam sees you and smiles. You walk over your hard 9-incher swinging and bump fists with him.

The two of you pick up Shayla making her squeal, but she doesn't resist as you place her on her knees on the bed.

Adam kneels before her and she resumes sucking, her eyes close.

Standing beside the bed behind her you part her ass cheek and lick her as, making her jerk.

She slurps of Adam's cock, "Oh MY GOD, you licked my ass! I've never had my ass licked before."

She wags her ass wanting more.