I love the idea in transformation scenarios where the "victim" falls into their fate of inhumanity "willingly." Drinking, eating, consuming something, taking medication and just feeling... Off afterward.
It's more than they bargained for, pushing them into and past their upper limits of being horny, feeling *good.*
They maybe pick up on the idea that something is wrong, maybe they should stop, but the process is already taking hold, changing them on the inside first and making them want it more
By the time they're no longer human, it's really too late. If they realized that they should have stopped beforehand, the fact only turned them on more, making them crave their changes.
They're bigger, hornier, and what's more, they realized somewhere in the middle that they didn't want to stop. The cat and mouse game internally of whether they should stop became a game, and they decided to lose it on purpose.
They don't care about going back, they'd never want it anyway. Being their new self feels so good, they may even think their old life was pathetic, beneath them. You'd almost never believe they were human to begin with.
Maybe they take it even further. Continuing on with whatever changed them, getting bigger, mutating further. The less they recognize in their current life in their new one, the better.
