Emma continues to fuck around and doesn't hide it from you

Later that week you get a text from Emma telling you to come home urgently. When you get home she's calls out to tell you to come to the bedroom, where you then find her sitting naked on the bed.

Emma's hair is a mess and her legs are wide open. You think she must have been masturbating and then decided that she just urgently needed the real thing. Emma tells you to hurry as she pinches her own nipple.

You strip off your clothes and Emma tells you she wants you to fuck her right now. Your cock springs into action.

Emma spreads her legs wide for you, and with one thrust your plunge your cock deep inside of Emma's pussy. You notice Emma's pussy feels somehow even better than normal. It's more silky smooth - and she feels even wetter than she usually does. She must have been really excited for you to come home, you think.

But when you look down as you pull your cock out and you realize that it's not just pussy juice on your dick - your cock clearly has semen on it. You realize you're fucking someone else's sloppy seconds! And Emma seems to really be getting off on it.

You try to pull back, but Emma is holding your ass hard and doesn't let you go.

"Don't stop, John," Emma moans.

"Who... whose cum is, is inside... you?" you stammer?