This can't happen! Or can it?

In the last five years of my life I've gotten married and now am 28 years of age. I'm on the shy side and a bit gullible to certain situations. My wife Nikki is a bit demanding, but always has been good to me. I've always been good to her too, though i did run into a girl the other day and for whatever reason we wound up in the back seat of my car. With her constant playfulness, i just couldn't stop myself.

Returning home i had decided to just let it go telling myself nothing like this would ever happen again. Relaxing in my recliner and having a beer as always, my wife Nikki enters the room, letting me know she's going shopping for a while. Giving her a kiss, i sink into the recliner sipping my beer.

Some time goes by and then hearing the side door open, i know she has returned, but something is not right as she storms into the living room shouting out..

"ALRIGHT NO DAMN GAMES! WHO THE HELL IS SHE AND WHAT THE HELL???"

I look at her in shock and reply quickly..

"Honey??? What are you talking about?? Who is she??? I'm confused..."

Nikki then drops a pair of Red panties in my lap, telling me she found them in my back seat and that they certainly were NOT hers.