My wife's first outside our marriage fuck involved a good buddy. She and I were at his house, drinking and smoking heavily. Cheryl got stoned and he suggested we go outside and use his hot tub, naked of course. I'll never forget his sitting in the tub watching her strip down. He was literally licking his lips, his eyes never leaving her. Once the three of us were in the tub, I had Cheryl sitting on my lap kissing me. He was across the tub watching her from behind. I moved a little and pulled her forward closer. My buddy figured out what I was doing and stood up, his penis standing tall. While I was holding Cheryl, he slipped up behind her and slowly slipped his cock into her from behind. She must have thought it was me but I've never been totally sure. I kept kissing her as he began very slowly stroking himself in and out of my wife's great pussy. He had a broad grin on his face and just slowly stroked in her.
After ten steady minutes or so, I saw his body stiffen up and he took hold of Cheryl's hips. Still stroking slowly, he pushed in and held it. I knew he was cumming in my wife. She hadn't acknowledged anything different and just sat on my lap kissing me. The big man finished and backed away across the tub. Cheryl had just been fucked by another guy for the first time. It wasn't until the next day that I asked her how she enjoyed him. She had no idea about the night before but that one happening set the stage for the future.