I'm not sure either of these are actually busty enough to match what he's supposed to have in the story, but getting boobs on a man from the AI generators I've tried is kinda hard. The first image has some weird issues where things don't line up because I was using img2img to regenerate parts of it to get the boobs and make them bigger. In the first image I like how his shirt hangs off his bust a bit, that looks more like what would happen to me.
This one finally looks busty enough to me. Still not happy with how the shirt looks below the boobs, it should hang off them a bit, and I feel like his nipples should be showing pokies.
Tried to make his hips a little wider here, I think it at least looks like his jeans are tighter around his hips. Had to start with the original generated image of a pre-change Chris since having the boobs for context made the AI really want to girlify him. I'd like to get the boob size from the previous one, the way the shirt hangs and the suggestion of his nipples from the first with the hips from this one...