Daughters Experience

I have a 16 year old daughter who thanks to my wife is absolutely beautiful. One Friday night after I got home from work late, me and the wife were hanging out, watching movies and hwving a drink. My wife told me that our daughter was hanging out with one of her girlfriends and they were over another girls house.
Knowing that our daughter was not going to be home soon we started making out. Then my wife realized how late it was and decided to take a shower before we started fucking wince we were alone in the house. Well, once my wife got in the shower I started jerking off and getting really horny. My wife finished her ahower and walked in our bed room wet and naked. Of course this is when our daughter returned home with her girlfriend in tow...
Myself and my wife scrambked to get dressed and went across the house to assess what the girls were up to and what there plans were for the rest of the night.
The girls asked my wife if she could make them some food since they were hungry and my wife obliged. While talking to the girls we realized they be drunk. Upon talking tomthe girls they did admit having a drink at there friends house while they were hanging out and confessed they spent some more money on flavored vodka and mixers. The girls proceeded to apologize and asked if they could just finish there liquor in myndaughters room and watch a movie. Myself and the wife hesitantly agreed to this request but mandated the girls drink a few glasses of water and talk with us in the kitchen while they eat.
We all ended up having a great conversation with our child and her friend and di not realize how late it was becoming. My wife was tired and retires formthe night into our bed room. The girls proceeded to my daughters room and I was enjoying a great movie that was on tv in the living room.
A few houra into the movie I start to hear female moaning. Thinking thia may be my wife masturbating I go closer near our bed room and realize it is not my wife. I go back into the living room and a minite later I hear it again.
I proceed to walk thru the house and hear it coming from my daughters room. I immediately ask myself if there were boys in the house? I confirm that I do not hear any male voices and remember that my duaghters friend is spending the night. She was 16 as well and a beautiful girl. At this tkme I hear them talking and kissing and moaning.
I was somhorny from earlier with my wife that I proceeded to stand in the hallway and stroke my hard cock to my daughter and her friend making out and touching and pleasuring eachother as curious female teenagers that were slightly drunk do during sleepovers.
Just listening to the soft moans and the kissing made me somhard and I came all over myself picturing the erotic setting that was taking place in my daughters room. It was so hot.... I find myself thinming about the details when I masterbate sometimes.