As we got closer to them and walked by, I noticed the guys were nude and the girl had a towel around her neck and from what I could see, nothing else....t that point, I remembered what my girlfriend had said about the swimming suits and I had a feeling we were going to be nude soon.She asked me where I wanted to put the blankets down and I pointed to a place between two bushes and kind of out of sight.We got to the place and as I got down on my hands and knees to spread the blanket out, I turned. “You mean, have sex?” “Yeah,” she answered.“Well, not since last year,” I said, wondering where this was headed. “Really?!” she asked, surprised. “How do you keep yourself, um, you know, satisfied down there,” she continued, with a giggle in her voice. My brother laughed nervously. “Why are suddenly so interested in my brother's sex life all of a sudden?"She revealed to him that she’d walked in on me while I was in the bathroom a bit earlier and told him what she saw which made her think to ask. Now I am sucking our new friends' cock, while it's coated with my thick gooey cum. I'm still shocked and a little ashamed, but I don't care. I slurp and suck all over his cock, licking up my own cum and loving every second of it. I feel like a cock sucking slut just like my wife is, and I am having so much fun.I suck faster and faster, not knowing if it's because I feel him getting harder or the taste of my gooey cum in my mouth. At this point I can feel him tensing up, and he starts bucking. ” this resulted in a skin rippling slap to her ass cheek “What was that?” he asks for a repeat and she willingly rewords her excuse “I came-” another slap “here to get-” slap again “fucked by-” a slap to the other cheek “you, even though-” from here continuously slaps both cheeks in rhythm “I'm happily married, f-forgive this heinous act of d-disloyalty! Punish my filthy body in your potent spunk sir!” that last line was all he could take, shoving her off his pulsing dick by the bruised cheeks,.