Long time lurker, but writer here. it would be a monologue from the point of view of a woman who's in her 70s. she and her husband haven't had sex for many decades. but right now he's in the hospital and dying. so she wants to have sex with him one last time. And it soon becomes clear that his dick is actually the fountain of youth. that's why they haven't been having sex. so when the monologue starts, whoever's reading it has this crotchety old voice, it's slow and halting, and as they start having sex the voice it goes from a woman in her 70s back through time. The woman is talking about all the horny years where they weren't able to have penetrative sex but were able to have every other kind of sex. The problem was that every time he was inside her, she would start getting younger and younger. and that was the problem. And such was their love for one another, that they agreed not to have any penetration so that the gap between their ages wouldn't get too far apart. but now at the end of his life, she figures they have nothing to lose, and so she gets younger and younger and finally she comes, her first orgasm from his dick in decades. and she is rudely interrupted at the end by a nurse coming in and saying to her, little girl, you should get off your daddy. hes very sick.