My mom and I have lived alone for a long time. I was a little over 17 at the time of what was happening. She was just under 40 and in her prime. I can't say she was a sex symbol, but she had some very attractive features. She wasn't very slender, but she wasn't fat either, she was average. Her breasts were small, but attractive in their own way, so when she bent over, I could not afford to throw a quick glance at her exposed nipples. But by far her most attractive and arousing features were her thighs and ass. Her ass was incredibly juicy, like many women of that age, quite large and firm, though at the same time incredibly soft. So when she stood with her back to me, and even more so when she bent over while mopping the floor, for example, my cock would literally stiffen, and I could only tear my eyes away at the thought that my mom might notice. Her thighs were in the same perfect condition as her ass. Moderately plump and firm, so I could spend hours imagining sticking my head between them, or better yet, my cock. Nevertheless, it didn't interfere with our daily normal communication, because I didn't tell her about any of the above, of course. And even though I sometimes secretly took her worn underwear to jerk off with them, and I never imagined sex with her, I was more turned on to imagine my mother being roughly and brutally raped by some guy or a whole crowd of guys, all this was only in my thoughts, which did not come out.I think we're done with the general description, we can move on to the story.