I have kind of an idea. Would you guys like if I wrote (or asked someone to write) a weight gain fanfic of Shouta Magatsuchi getting massively fat? Not Lucoa, just Shouta. His weight gain would have been orchestrated by Lucoa, though (because she thinks he would be cuter, soft ans huggable) It would go all the way from just fat to hyper fat, then blob/immobile and maybe even planet-sized. Shouta would be forced to wear even skimpy/undersized clothes, such as a white sailor fuku.
Although there could be an addition of more sexual content (Shouta basically becoming the cumdump of whatever male that sees him, probably with Lucoa even starting to profit from it at some point, maybe making his moobs into breasts capable of lactating and applying makeup to him for that "femboy-hooker" look), including fattening by cum consumption, I will wait to know what people would be ok with and what not.