It was the Friday before memorial day weekend 81, my sister was 8, in 3rd grade, I was 9, in 4th grade, my mom was 37. We would turn 9, 10, 38 by late in October, early in November, late in November in that order in that year, and I knew my mom was somewhat 4 and a half months pregnant.
That morning I got up, and ready for school, I wore my striped speedo under my basketball short shorts, (that's what they were at the time, short shorts), and teeshirt. When my mom hugged me goodby before I went off to school that morning, her baby bump had just started showing. When I felt my mom's baby bump rub up against me, when I'd hugged her at that moment, my dick got all nice, and hard, even at 9 years old, in my short shorts! My mom had her robe on all that morning, and I did not want to look underneath there anyway, I just wanted to get off to school on time. Lucky for me, as I'd started walking off to school that morning, my dick stopped getting so hard, I kept my backpack in front of my short shorts, that way nobody noticed anything.
That afternoon, when I got home from school, my mom was out, so I just took off my teeshirt, and still kept my shorts on. Then a little later that afternoon, after I'd got home, when I heard my mom's car pull up, my dick got hard all over again, I stayd put at the kitchen table doing my homework, or pretending to anyway.
Both my mom, and my sister got home from my mom's baby doctor appointment, and ooh, were they happy to see me, especially when I had no shirt on, just my short shorts. Since my dick was all hard, from my mom's pregnancy showing already that day, I had to keep both my legs closed together, so neither of them would notice how turned on I was by my mom's already showing baby bump.
First ,my sister stroked the back of my neck, kissed me hard on my lips, intentionaly turned around, bent over in front of me to fix her shoes, or so she said, she had one sexy tight black pantycrotch for just 8 years old under her little miniskirt at the time, she had legs so sexy too. Then when she took her blouse off, she had on one hot little black tween bra, her tummy was all nice, and flat. The waist band of her skirt passed just over her belly button, then when my sister turned around, the hemline of the back of her skirt, was up so high, even when she stood up straight, there was such a sexy flash of her hot sexy panties, and what a tight little ass she'd had too, then when she took her skirt off, what a tight little body for such an 8 year old girl at the time, it made my dick start to throb in my short shorts. Then as she climbed up in my lap, she'd spread her legs, flashed her hot black pantycrotch, wrapped her legs tightly around me, and she'd kissed me hard on my lips again. Then as my sister had climbed out of my lap, she'd turned around, slammed her hot little ass back in my lap again so hard, that when she'd felt my dick throb a little against her tight little pussy, she'd said to me "Wow -, your weeny feels so hard against my vjj, I'd love to have your baby some day, I mean it!" My mom smiled the whole time at her big display. Since the school staff at our school was allowed to spank students who were bad, my sister had used that as an excuse to get herself paddled, especially by cute male school staff. When my sister wanted me to paddle her, I was confused about it, then my mom had almost grabbed my arm, and coerced me into paddling my own sister. So when I paddled her ass, she moaned, and gasped, she'd loved every moment of that paddling routine. I must have given her 30 lashes untill both my hands were tired. That was the first time I'd ever put my hands on anyone's ass like that, even for my own sister. Since my sister had tightened her ass so hard, I found that paddling someone was not as easy as it looked. When I'd got done paddling my sister, she smiled, and she'd flung her long flowing hair, it made my dick all nice, and hard in my short shorts, and my sister had enjoyed being paddled that day. Then my sister had stayd in her tight little panties, and tween bra for the rest of that day.
After my sister went to her room, then my mom had her turn, she'd lifted up her big blouse, out came her then newly growing baby bump under the high front of her skirt for pregnant women. What had made my dick grow hard in my basketbakll short shorts ,was how little my mom had showed off of her then somewhat growing tummy between the front of her skirt, and bra, and what a bra. After I got done feeling my mom's baby bump, I went to my room, stripped down to my striped speedo, and I'd masturbated in it, it felt real good too.
Then that night when I got ready for bed, my mom had come in my room in her short shorts, and big blouse. Before I went to sleep, my mom again, lifted up her blouse, my dick got suddenly hard, and throbbed a little in my striped speedo, especially as the high front of her short shorts for pregnant women had swept way over her then growing baby bump. What definitely fuled my sexual desires in my speedo for 9 years old at the time, was the little bit of somewhat growing bare tummy between the high front of my mom's short shorts, and bra. For awhile, when I caressed my mom's tummy, and had admired her bra, she'd caressed my speedo crotch, where my dick had throbbed hard.
Then when I wanted to go to sleep in my striped speedo, my mom had not only invited me to sleep with her in her room, I got sexually aroused in my speedo, especially when she stripped down to her high over the growing baby bump panties, and bra, they'd revealed very little bit of her somewhat growing bare tummy.
The next day, when my mom, my sister, and me were at the beach, I was in my black speedo, my sister was in her black bikini, my mom was in her black bathing suit for pregnant women, and even with my mom's bathing coverup, my dick had got just as hard throbbing in my speedo.
I was sure shocked, especially when my mom had lifted up her bathing coverup, my dick had throbbed hard in my speedo. A few other guys had got all turned on, and felt all sexy hard in their own swim suits too, especially when my mom had revealed her then growing baby bump under the high front of her bathing suit bottoms for pregnant women, then there was that very little bit of my mom's then somewhat growing bare tummy, and she'd even revealed her bathing suit bra too. My sister was turned on by how my mom had revealed her then pregnant figure, that was back at a time when it was unheard of for a pregnant woman to bare her tummy at any time through her pregnancy. That's how I got a big case of maiesiophilia.