My mom's bra and short shorts

I was 14, it was 1973 and my mom was 34 and had always been single. It was a hot summer day and she was dressed in tight short shorts pulled way over her belly button for the first time and her nude lace bra gracing her beautifully swelling breasts, showed very little of her still nearly flat tummy. I was only wearing my tight bathing suit because the air conditioner was broken.

I stared at my mom's hot little ass cheeks and her lusciously slim legs in those short shorts of hers as the back of her bra hiked up lots higher, showed lots more of her back than her tummy when she leaned against the wall fanning herself when she said she needed to talk to me for a moment.

She said "Son, you probably haven't noticed but mommy's tummy's started to change a little." I had noticed, but I didn't say so. She said, "The reason is, mommy's going to have a baby, this is why mommy's got on such big stretchy short shorts for the occasion and mommy's so proud to soon have nice big breasts too."

I forgot exactly what I said, but it was something like, "What? How....I mean, who is the.." She cut me off by saying, "How and who isn't important. The point is before long you're going to have a baby brother or sister. Isn't that exciting?"

I guess I was just staring at her tummy because after a few awkward seconds she took my hand and put it on her tummy, and I couldn't resist caressing it, especially when I had an incredibly hard erection in my bathing suit. She said, "You can't see much yet, but there's a bump there, can you feel it?" I nervously said "Yes."

I don't know why, but I just kept rubbing her tummy and as I did so, for whatever reason, I knelt low to the front of my mom's short shorts and kissed her barely visible baby bump. She said "Awww son, that's so beautifu!." But just after that my hard erection got so incredibly huge, it started wiggling around in my bathing suit, I moved back quickly.

It was a good thing I ran to my bedroom when I did, just as I closed my bedroom door, my erection suddenly popped out of my bathing suit and when I pushed it back in, I cummed in no time and the entire crotch of my bathing suit was completely stained.