Again another true story from the past. Kathy and I had made friends with another couple, Karen and Steve over the past year, although we really hadn't become close friends. Ever since Kathy's 25th birthday the two of us had a very open relationship. Every week she had her nights out and so did I, there was never any restrictions on time to come home or who you were with, it was just a night to enjoy and have fun. After each of these nights we would come home and tell the other all about the evening we had just had and then have the most wonderful sex ever. I had a new job and it required a lot of hours and most evenings I wouldn't get home until around 9:30. After Kathy had fixed me a bite to eat she would take off for the evening, I would turn in around 11:00 and what ever time she came in, she would stop at the bathroom and strip and crawl in bed and start going down on me as a way to wake me up. Lots of nights I would be awake when she came in but I would pretend to be asleep just to be wakened up this way.
I knew that Kathy had fucked Steve on more than one occasion, especially on his birthday, but that is another story. Karen was around 5' 10" and had a pair of tits that were worth dying for; I would guess that they were at least 40's.
It was on Monday night and I couldn't get off from work until after 10:00 and I was tired. I came home and ate a little dinner and went to bed, Kathy said that she was going out with Karen for the evening; I gave her a kiss and told her I would see her when she got in. I don't know how long I slept but was awakened by a noise in the bathroom and I knew that Kathy was home; again I pretended to be asleep so I could receive my reward. Soon I could feel the covers being pulled back and the warmth of another body crawling into bed with me. As I lie there on my back still pretending to be asleep, I could feel the hot breath on my cock; it was hard to keep it soft until the sucking started. Soon the sucking started, but it seemed different somehow. There was a circular motion that had not been there before; I just figured that she had learned something new on this night out. Soon I was hard as a rock and things were really starting to move. I reached down with my hand to cup one of Kathy's tits but to my surprise they had grown to twice their normal size. I was stunned.