In 1983 I was 27 and having an affair with an early 20s London flatmate, a slim but big-busted Oxford grad. She wasn't ticklish but had very nice feet, liked to be spanked, used to paint her toenails black, and always wore stockings rather than tights.
Her thirtysomething boyfriend was her ex-senior tutor. He'd come to visit her periodically and she loved him but he was the personification of a bespectacled nerdy academic, had a whiny voice and always walked around on his toes because his Achilles tendons were too short or something. He was also incredibly intelligent, very well-read, extremely mentally stimulating but ill-hung and useless between the sheets, C. used to tell me mournfully when we'd shag. Quiet with him, she used to shriek the house down with me.
Anyway, once she was sitting in the hall armchair naked, talking to him guiltily since he'd phoned just as we were basking in the afterglow. This annoyed me, so I parted her thighs and went down on her with all the subtlety of a wild boar rooting for truffles. It was very gratifying to feel her trembling as she tried to maintain her composure and conversational demeanor for a few minutes, until she told him that she had a migraine and really had to go. Immediately upon hanging up the phone she orgasmed very noisily then collapsed and told me she hated me, but not THAT emphatically, so I grabbed one of her ankles, hauled her back into my room and ravished her again. It was fun. She thought so too.
Later she broke off with both of us and left, eventually gaining a doctorate and becoming a university professor, someone told me. And about three years ago when visiting England I encountered her at a dinner party thrown by a mutual friend. She'd cut her hair and unfortunately looked very old indeed. I admit that losing her had hurt a lot, but in retrospect, especially considering the woman to whom I have the pleasure of being married now, her leaving was the best thing that could have happened to me.
Any fellows in a similar position- you may well find out in a few years that this is your situation as well.
No names, but this was her way back when.