Interesting idea. It could work well with the corruption system I plan to add in a future update, which would let you turn normal girls into feedees. Perhaps part of the process would be to max out their gluttony.
it would really be more of an aesthetic change, but i like the idea of these kinds of statistics being displayed as over 100%, leaning into the idea of their appetite and desire growing far above normal. Under the hood, it would work like a normal stat. but a normal NPC, untouched by the player, would have it listed as a percentage between 0-70% or so, Like Fitness, but the true cap is 999%