Me having a crummy laptop is the main reason I’ve never tried game-making but a lot of my personal creative writing follows the same formula and this and it’s definitely cuddly-first and horny-second. I have always been kinda inspired by hyper and all the legitimate internal chemical reactions that’d need to take place for the flesh and cells to rapidly replicate, not to mention milk production. Ik it’s meant to be dumb horny whatever but it’s fun to think about logistics with this stuff (and Yuri being able to move/walk around at all is neat too)
The main focus of the kink, I think, is juxtaposition. Big means nothing if there isn't small to go with it. Ludicrous only gets noticed when it's surrounded by otherwise normal. Gigantic tits are best suited for foxes of a tall, but otherwise average stature. Sometimes you need to, as a storywriter, shove some inconvenient details under the rug when nobody's looking, and other times, you need to point at the plothole directly, wave your magic wand, and make it disappear right before the reader's eyes.
There's a few representations and explanations for hyper as a concept, but the best ones tend to combine the right level of physics and rationality with complete and utter absurdity.