Ever since I was ten, I've lived alone with my Mom after she divorced my Dad. I never really knew what happened between my parents, but ever since then Mom never dated anyone seriously. Once in a while she would have a guy stay the night, and as a kid I never gave it much thought. But she would usually only fuck a guy once before it was over.
Anyway, when I was eighteen, I one day realized it had been a few years since she had gone out with anybody. My Mom is good-looking, and I must say she has a great rack. I've seen her in her underwear plenty of times over the years to know her body is also in good shape. That's why I was surprised she wasn't dating anyone. But she did work a lot, so I figured she just didn't have time to date.
I myself was a virgin and had never done anything with a girl before. I'd done plenty of things with my hand, which I was getting quite fond of recently. Mom and I were pretty relaxed around the house, like I said, I had seen her almost naked enough times that it wasn't a big deal. It seemed like she enjoyed wearing as little as possible. When we got a pool put in our backyard, suddenly she was always wearing her skimpiest bikinis. That was challenging for me, because at this point my mother, being the only female around, was becoming the object of my sexual fantasies.
Whenever we were in the pool, or if I saw her laying in the sun, I would get an erection. If I was in the pool, it was no big deal because I would swim around until she left or I distracted myself long enough to calm my groin down and run to the bathroom where I would picture my dick between Mom's tits, sliding in and out until I came all over her chest and neck and face. I usually came within a minute while thinking about fucking her like that.
One day, Mom was sunbathing and I was swimming, and after a while she untied her bikini top and laid on her front. No big deal, she couldn't see me staring at her when she laid like that, and I would usually stroke myself under the water until I felt like cumming, then I would sneak into the house and finish off in the bathroom. However, while she was laying on her front this time, she heard me get out of the pool and looked up.
I usually made it into the house before she saw me, either because she was taking a nap or she simply didn't bother to look in my direction. Now, though, I was standing right in front of her near the patio, and my swimming trunks were bulging quite obscenely. I was so embarrassed, there was no point in trying to hide it now. I just froze, hoping she wouldn't say anything even though she was staring right at my crotch.
After a few seconds she looked up at me. "Is that why you're always running into the house when I'm out here?"
"I...uh...I just have to go to the bathroom."
That was legitimate, sort of. I was, after all, going to the bathroom. Mom smirked at me, and laid back down, facing away from me.
"Sure," she said.
I hurried into the house, my erection not dying down in spite of my embarrassment. I hurried to the bathroom and didn't even have to fantasize about my Mom's tits before I came into the toilet bowl. I groaned out loud, my orgasm was so intense. I peeked out the window to where she was laying on the lounge chair, and to my surprise she had taken her bikini top completely off and was face-up. I had a great view of her tits, and my erection came back to life in an instant.
She had never done that before, so I wondered if she was trying to tease me, or if she was just trying to get some sun on her front before I came back. But when I opened the patio door, she glanced up at me and then closed her eyes again, not bothering to cover herself up.
"I didn't want any tan lines," she said. "I hope you don't mind."
I just stared at her for a moment, not knowing if I should say something or hurry back inside the house to jack off again. Mom opened her eyes and smiled.
"Are you all right?" she asked.
"Uh, yeah." I realized my cock was straining against my shorts, but somehow I didn't feel like covering it up.
Mom glanced down at my crotch. "Weren't able to relieve yourself?"
"No...I mean, yeah. I mean no!" It was pointless to argue that I had indeed been masturbating, and she knew it.
"That's okay, I figured you were doing as much."
Talking to my topless Mom about masturbation was having an odd effect on me. I was aroused, but confused too. I hurried back into the pool, where the cool water would calm me down.
After a while, Mom stood, and I thought she was going into the house. I was a little disappointed, since I had been ogling her tits since I had first seen them. But to my delight, she stuck her thumbs in her bikini bottoms and pulled them down. I saw her neatly trimmed pussy and nearly shot off in the water. And then she came over to the pool. She was going to swim naked!
"Can I come in with you?" she asked.
I nodded dumbfoundedly. She must have known what she was doing to me. She swam around, and then started splashing me a bit. I played around with her, but then she started swimming very close and I felt her breasts brush up against me. I was so hard I thought I would tear through my trunks.
"Why don't you take your trunks off," Mom said.
I was shocked, but then I found it hard to disobey a naked woman. I took my shorts off and tossed them out of the pool.
