Between 220 and 280 lbs I gained evenly on my whole body, between 280 and 315 lbs I gained most of the weight on my belly and between 315 and 350 lbs I gained mainly on my thighs and butt.
Two people start dating, fall for one another, and become comfortable enough to confess something: they're both feeders. It's a curveball, definitely. Neither of them are feedees in the least, and they're not interested in mutual gaining. What to do? Their relationship is perfect aside from this, but it isn't something either of them can deny.
So, they discuss the possibility of adding a 3rd to their relationship: a serious feedee. Someone who is ready to completely throw ambition aside and basically become a doted-on house pet. The couple can have their feeder desires fulfilled, they maintain their loving relationship, and the feedee gets to be double overfed.
After a little while of searching, they find someone perfect. All three have been chatting for a while, they've met up a few times, and they're all in agreement for the feedee to move in to the feeders' house.
It begins immediately. All parties are eager to start. The feeders make sure their feedee is eating 5 full meals per day, with snacks. The feedee is completely adored. Hand fed, encouraged, caressed, just spoiled beyond belief. The arousal that builds as feedings continue is unrivaled. Absolute euphoria.
The effects of such infatuation on all sides is...startling. In just a short amount of time, the feedee has piled on weight like crazy. With food and attention in excess, their body can't help but swell to more than twice the size of either of their feeders. Every need and desire is fulfilled. They're enabled to be the ever-fattening partner that each of them wanted.
For the feeders, just having a feedee that they can share is a strong aphrodisiac. Not only can they not keep their hands off their fattened pet, but they can't keep their hands off each other. The house is just permeated with desire and indulgence.