I saw Matt fumble with his trousers and then I saw him pull his cock out.At that point I was dumbstruck, my eyes were glued to the library and I could...’t move. Talk about being stuck in the headlights of an oncoming car. I let out an involuntary gasp, causing Brian, my co-worker facing me to ask if I was alright. I just nodded. Fortunately he was facing me and not the library.When I looked back at the library, Matt was in full flow. His tablet was on the table in front of him and he was jerking. She probably wouldn't anyway. We'd both promised Barb. Instead I said I was going to bed. Tally said she was tired, too. I helped her -- not that she needed it, she was used to hopping on one leg -- to her room and got her tucked in.I went into the master bath off our bedroom and took a shower. I finally was free to relieve the pressure Tally and her stories had built up. I started stroking. It didn't take long for me to reach my climax. I popped when a picture of my Barb with her face buried. She was in a state of extended erotic stupor. I was on a high of sexual pleasure of my hard penis being plugging cunt. We lay still in a post coital sexual bliss with our fucking organs locked into the warmth of each other. After about half an hour she murmured softly “Again, fuck me again, please, ek aur baar chodho mujhe.. Meri chooth ki pyass bujha do..do it once more pleaseeee” she said softly and began pistoning her cunt into my penis. Moaning, I pulled my penis out from her cunt, pressed. After about ten minutes I had her stop so I could get a little breather. Carrie backed away and I got up, taking Ruths hand. I had her lay back on the blanket in the middle of the floor. I turned to Carrie and reached behind her unhooking her skimpy little bra. She slipped her arms out of it and I got a look at her good sized, firm breasts. I led her over to her granny and had her get down in between Ruths legs. Once again, she seemed a little hesitant, but she knew what she was supposed to.