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I had been married for 18 months but never had an orgasm in my life when a tall, dark and very sexy man came to work at my office. He had been married to his plump red-headed wife for about the same length of time and we got on well from the start. I think we both sensed there was something missing from our home lives.

One night, we were at a works do and started slow-dancing. Before long, I could feel his hard cock pressing into my mound through my dress as his tongue drove deep into my mouth. After a while, our colleagues noticed our closeness, so we went outside where we could be private and he slipped my tits out of my top and sucked the nipples til they were hard and red. I had such an ache in my cunt and his cock was fit to burst but we had to leave and go our separate ways.

After that, we took every opportunity to grab a feel of each other as we passed at work, or to have a deep kiss. The risk of being spotted made it even more exciting.

One night, we managed to stay at the office until everyone else had gone home. I was desperate to have him in me and, whilst I never thought I wanted children, I wanted my belly swollen with his baby so badly. I had become very careless with my birth control and had started making excuses to my husband why I would not fuck him. Anyway, once M and I were alone, we went to the couches by reception and started some deep kissing and feeling of each other. His cock was rock hard and I couldn't resist sucking it - he said it was the first time anyone had done that to him! Then he started fingering me and I helped him rip my panties off before dragging his trousers down and freeing his hot, hard cock. I can still see how the pre-cum oozed from the tip and I remember my juices puddling under my ass as I pushed my hips up at him. He wasted no time in plunging his cock deep into my cunt and started fucking me, pushing his erection deep into me with each thrust. As his movements got quicker, he said he wondered what our children would look like. Knowing I was in my fertile time but that he thought I was on the pill was such a turn-on and I had my first ever orgasm as he impregnated me with our daughter - who looks just like him.

We saw each other every day until I left work on maternity leave and he took great pleasure in how big my tits and belly got thanks to his potent seed. I would have liked other babies with him but he had to get his wife pregnant and I had a baby for my husband, so it was fair.

I love being pregnant, with a big belly and swollen, heavy tits and wish I could have another child now but it's probably too late.