David and my Wife try to explain

Danni and I look at each other then we look at our two cheating spouses. The silence stretches on for long enough to make everyone even more uncomfortable, finally David speaks looking at Danni and I, "Umm I'm sorry that you had to find out like that. We did not mean to hurt you, we were just fooling around, it was not serious between us."

Danni screeched out, "Fooling around…not serious…, Jesus Christ you bastard you were fucking my best friend. You let her blow you and you shot your load on her face. That seems pretty serious to me!"

My wife spoke up then, "Danni I am so sorry I just needed some variety and you always talked about how great David was in the sack, I just needed some sex, it was not serious, we don't love each other," and then looking at me she said, "I still want to be married to you!"

Danni kept on screeching, "Well it looked pretty fucking serious to me, you seemed to be pretty into my husband's cock being shoved up your lying little cunt. If you will excuse me I am going home and then she stomped out of the room. David ran to follow her, and my wife ran sobbing to our room. Suddenly I was alone. How strange it was I thought that just a few minutes before things had been normal, and then I show one little tape and the whole world changes.

I rewound the tape again and started to watch. I could feel my cock harden, stiff and hot in my pants, as I realized it turned me on to watch my wife being fucked by another man. I pulled my cock out and began to beat off while I watched the tape, I watched my wife suck his hard cock. David was bigger than me and she probably liked the feel of his big cock in her mouth and pussy. I watched how she sucked him until he ejaculated all over her face and tits, his white sticky cum running down her nose and lips, dripping from her fat, stiff nipples.

I watched David eat her out, bringing my normally quiet, reserved wife to a screaming orgasm. His face was shiny with her cunt juice as he flipped her over and fucked her doggy style, reaming her cunt, making her cum over and over… Suddenly my cock was spurting in my hand. The long strings of cum coating the TV picture in front of me. I had jacked off watching my wife getting fucked by my neighbor. I was not mad, I felt a little inadequate at not being able to satisfy my wife, but I was more curious and turned on, than mad. I watched David drive to the balls in my wife's cunt as he climaxed moaning and groaning about what a great fuck she was, how tight her pussy was. I wondered when the last time was I had complimented my wife's prowess in bed. She was a good fuck, I knew it.

The question is what should I do now?