Big men have trouble accepting their bodies, always worried about how they look in their clothes. It's hard convincing them that it's their round plush figure drives you crazy, that their fat cheeks and jiggling bellies is what makes them sexy. No matter how many times you tell them that you love seeing their chubby ass, they can't accept seem to accept it.
The fact that they can't keep a shirt that fits them drives you both crazy. Their waist seems to be getting bigger, their shirts constantly riding up on their rounder bodies without their knowledge. Their midriff will be hanging exposed out of their sightline, their faces growing red with embarrassment the moment they see their reflection. It just seems to keep happening to all their shirts.
It takes a little convincing for them to start going around the house without any top. It's just easier to just let it hang out rather than be upset they can't fit into any of their clothes anymore. It's cute seeing them walking around the house, embarrassed, trying to hide their enormous body with all their fat curves exposed and easy to grab. It isn't long before their pants no longer fit, letting you tell them to not worry about it and just go around in their tight jockstrap.
They sleep next to you facing away, not able to comprehend that you love seeing their bodies like this. It isn't long before they'll grow used to it, being constantly exposed and growing bigger. Once you show them you'll love them no matter how big they get, they'll accept it, letting themselves grow larger and larger into round balls of dough. You can't get enough of their smile when you bring them food, watching their chubby face unable to stop stuffing their maw full of the greasy fat and calories that made them this way. You might have helped a little, only getting them to realize their full potential.