You've always wanted to have a threesome, and your wife has found a cute unicorn for you! But wait... it's a GUY??? But you thought...
She assures you that it will be fine, and that you'll like it. After all, a girl couldn't hit your prostate like that.
She starts stroking your cock and tells you to lie back, and relax. Then HE takes over stroking, and she fingers your ass to loosen you up. Wait, loosen you up for what?! He's not going to... omg he is. He's going to fuck you in the ass. He spits on his dick and slides it gently into your tight little hole. It feels so good that you loosen up quickly. You moan with pleasure as he fucks you, and she jerks you off, faster and faster, until you both cum together.