I had undressed and was standing in my underwear. What I saw in the mirror wasn't pretty. I was putting on weight again and if I didn't get back on my diet soon would need a whole new wardrobe before long. We had just settled into the condo we had rented in Florida and were getting ready to head to the beach. The swimsuit I'd purchased only a few weeks ago was already a size too small and I felt like the Goodyear blimp.

Unhooking my bra and letting it fall to the floor, I stripped off my panties and stepped into the swimsuit. As I bounced up and down on my toes struggling to pull it up over my 70" rear, the growing bulge in the front of my husband's trousers told me that he wasn't entirely disgusted with my 300 pound body.

Addicted to sex and constantly horny, I wasn't about to let a perfectly good hard-on go to waste. I toyed with his belt, then his fly. With his pants pooled at his ankles, hubby spun me around and leaned me against the bedroom door. The swim suit was still around my thighs and I spread my legs wide, stretching the elastic between them. Every muscle in my fat body tensed and coiled like a spring ready to explode.

Hub yanked down his underpants and stepped up behind behind me. With one arm folded against the door, I rested my head on it and reached back with my other hand to guide him while I raised up on my tiptoes. My back arched and I whimpered as hubby plugged in. We were hard at it, both on the verge of an orgasm, when our 18-year-old son knocked on the door then pulled it open without waiting for a reply.

The door swung outward and I tumbled forward. With his pants around his ankles, my husband fell with me and we landed in a heap on top of our son knocking him the floor. We separated during the fall but our climax was already underway. I was struggling desperately to get my husband's cock back inside me when he ejaculated and sent a stream of hot sticky juice on to my ass and down the back of my thigh. I got my orgasm a split second later grinding my soaking wet pussy against my son's leg, hunching like a terrier it heat.

Everything in my upbringing had taught me that incest was wrong and it doesn't say much good about me as a mom but while the three of us lay on the floor trying to gather our breath, I gripped the waistband of my son's swim trunks and started them down. A moment later he got his first blow job while my husband looked on.