Wifes Friend

A couple of weekends ago i went out with the guys for a few drinks. My wife had one of her friends over while i was out to watch movies and have a girls night. I got home around 2 am and found them in the hot tub in the backyard. Nothing unusual other than they were both naked and pretty drunk. When they first saw me her friend Stephanie dunked down under the water to cover her tits that were exposed when i first came out. I asked what was going on here and they both just smiled and said just having a couple of drinks.
My wife asked if I wanted to join them. Stephanie is divorced, 38 with a couple of kids and has a killer body. So I said sure. So i started to strip and my wife told me to keep my underwear on. I jumped in with them and we started drinking and talking. I asked what they had been up to while i wasn't home and they smiled and said lets show him, and they kissed. Now, this shocked the hell out of me because i have never seen nor did i know my wife had ever wanted to be with another woman. We once played with the idea in a fantasy role play with her describing what she would do with another woman while we mutually masturbated but that was as far as it went. At least that is what i thought.
As you can imagine i was instantly hard. My wife looked at me and said there was only one rule, i could watch but could not touch. I watched as they started caressing each other and kissing and sucking on each others tits. At this point I pulled off my underwear and started stroking my cock. I watched as Stephanie helped my wife to the edge of the hot tub and spread her legs and started eating my wife pussy. I sat myself up on the edge on the opposite side of the tub and stroked my hard cock as me and my wife looked at each other. I watched Stephanie eat and finger my wife and could here her moan. Then they switched positions. There was her friend sitting in front of me legs spread, showing me her trimmed sweet pussy as my wife starting to slide a couple of fingers in. Then i watched as my wife spread her pussy lips, look at me, smiled and started eating her out. At that point i could not take it anymore shot the biggest load i have ever shot in my life all over my wife's ass, back and Stephanie's stomach and pussy. I sat back down in the water and just watch as my wife ate her friend to orgasm and then her friend finished her off. We did not talk much more that night since we were all exhausted and drunk. We went to sleep and i got up the next morning and made us all breakfast and Stephanie left with out us talking bout it. After she left all my wife said to me was how was your night out with the boys.