Fattening others

Certainly. As my wife has gotten fat she's blatantly expressed that she'd like me to have a lifestyle more like hers: watching Netflix for 4-5 hrs a night while snacking. And I just can't do it.

I'll watch a movie here and there with her; but I can't fully adopt her fat couch potato lifestyle.

I've gained as well over time but my primary interest is in transforming her. As you say; "weight gain transforms someone in a fascinating way"

I get the same body modification kick out of making her really fat (well, obese now) as other men do when they want their wife to have really big implants, or bimbofy them by getting lots of lip filler.