Disclaimer: This is a story in which fictional characters cheat on their spouses. If you find this sort of thing offensive, I recommend not reading any further. You have been warned, so please don't send me feedback or post comments telling me how wrong it is for married people to cheat on their spouses. This is fiction. Although the characters are based on real people, to the author's knowledge they have never actually engaged in illicit sexual activities with each other or with other married or unmarried people.
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I was standing in my sister-in-law's bathroom with my tool in my hand. Not that tool; get your mind out of the gutter...at least for now. I was helping her replace her shower head, which is not a complicated task but it was one that her husband had been putting off for too long. Finally, one weekend when he was out of town, she enlisted my services to help her take care of it. She didn't want me to just come over and take care of it for her; she wanted to be involved enough so she would know how to do it for herself if there was a next time. So I had a pair of pliers in hand because the existing shower head was pretty old and pretty gnarly. It was a pretty cheap model, too, so she was going to love the replacement that my wife had helped her pick out. She'd been spoiled using the same one at our house when we'd been on vacation and she was house-sitting. Since she knew I'd installed that one, she knew I'd be able to help her install one like it at her house.
We got the old shower head off and just threw that thing away, then cleaned up the threads before wrapping them with Teflon tape. The new shower head screwed on easily and we didn't even need any tools; we just hand-tightened it and it was ready to go. I turned the water on and the flow was so much better than the old one had been. Such an easy task that would have such a positive impact on each day.
"I think the next thing," I said, half-jokingly, "is for you to go ahead and jump in there to try it out and I'll hang out right here in case anything goes wrong."
"Wouldn't it be even safer," she asked, "if you were to just join me in there so you'd be that much closer to handle any emergencies?"
We had flirted a lot since even before I'd married her sister, but nothing had ever happened between us. There had been a few moments when it felt like we got kind of close and I thought this was just another one of those. In fact, I was expecting her to laugh when she moved toward me instead. Tilting her face up toward mine, she reached out to hold the back of my head then she kissed me. I offered no resistance and, as our tongues slipped into each other's mouths, I reached down to grip her ass, pulling her against my now rigid tool. We only parted when she slipped a hand between us to confirm that it was my cock she was feeling between us, not something from my toolbox. Once she'd confirmed it, she started to open my shorts and soon had my cock in her hand. She pumped it as she maneuvered us toward the nearby toilet, then sat on the lid and worked my underwear down; I'd stepped out of my shorts as we'd moved.
With my throbbing cock right in her face, she raised it as she gently pumped it so that she could lick my balls. I only stopped watching her long enough to strip off my shirt then focused my attention on her as she wrapped her lips around my tool. I moaned as she engulfed my tool in her hot mouth, gently pumping the base as she slid her lips up and down my shaft. I'd given plenty of thought over the years to what it would be like to have my sister-in-law blow me, as well as what it would be like to fuck her and eat her pussy, but my fantasies paled in comparison to the real thing. I knew it would not take long before I was cumming down her throat with the skillful and practiced way she was sucking my cock. I was perfectly okay with that, not only because the pleasure I was feeling was incredible, but also because I figured it wouldn't take much to recover once I started undressing her and buried my face in her pussy.
It occurred to me that, as aroused as I was, she was probably in a similar state and that her pussy was probably incredibly wet at the moment. I certainly thought that slipping my cock into her would feel amazing but, if I stopped now to do that, I knew that I'd cum in a matter of seconds. In any case, I wanted to devour that juicy pussy before I fucked it and filled her with a load, anyway. Thinking about getting her naked and eating her pussy as she continued to suck my cock had my orgasm building up even more quickly. Even as my cock was swelling more, she never hesitated and just continued to suck me off, which only caused it to keep swelling. I wasn't trying to hold off my orgasm and I don't believe that she was either so I was just savoring the pleasure I was feeling until I suddenly I started spurting into her mouth with a groan.
She wasn't thrown off and continued to suck me off as she was swallowing my load. Only once I was fully spent did she let my cock fall from her mouth and straighten up. She looked up at me sort of uncertainly as she released the grip she still had on the base of my cock.