A gainer/feeler couple cuddling together after a long night of feeding, talking about how much more the already very fat gainer wants to gain, which is turning them both on.

What species?

How about a pair of dragons? Maybe one Western and the other Asian?

College age Takato and Guilmon having a mutual gainer relationship?

hmm sounds fun

Ah...A video game with cakes in it.

oh come on, you can do better than that

*squints* Hmm...A video game with a dessert world setting. And it gets harder to play cause the player and their character get bigger and fatter the deeper they venture in it. And they're told there may or may not be weight loss should they win.

A feeder sends her gainer out wearing only a trenchcoat to engage in momentary acts of exhibitionism.

(Sorry, I had to inflict that thought on someone else.)

A Lucario fattening his trainer lovingly? Lucario tf optional?

Nice! A classic

A Lion finally gets a house butler robot, first night after getting it up n going, it logs on to the master's computer to find his porn stash and finds out the healthy, fit king of beasts is secretly in to Weight gain. Robot butler slowly changes in to a feeder/master relationship and uses the lions credit card to make purchases to upgrade itself for the tasks at hand, Becoming more lionish itself while getting feeding hose attachment among other things.

I feel like that’s a good starting point, but a bit too detailed for what I’m trying to do

No worries~! Love your work

That is an amazing idea!

dozen ways it could go
Chubby lion owner manages to call I.t. to find out there's a way to reset the lion bot, only to find out it's installed a 'back up' update file that gets reinstalled in the night, and the lionbot prepares a feast for twelve lions in the morning because lionbot think's he's missed a dozen meals because the internal clock didn't match the update's last save, And its all going in that lions belly.

Chubby lion owner complains to the company via phone who deiced to send a replacement, only for the first bot to decide to keep his 'twinbot to easily double up on the pampering of the chubby lion.

Juuust as mobility has become limited without regular breaks or the ever helpful lionbots, our 600 pound lion gets his plump paws on his confiscated phone from a tall shelf with the help of a umbrella as his stuffed taut gut ahead of him previously kept his paws from reaching the phone to call for help, calling his tech friend to figure out how to save him.
*winks* said friend is secretly ordered a badgerbot to feed him up in the morning after unlocking the lionbots moral restrictions under duress as a lion bot arrived with a ten stack of pizza's and would stuff said badger friend till the techie gave in.

Sadly my writing skills aren't very deep, but theres a dozen turns this battle of wits and guts could go... World domination maybe? Or simply weighty worldly widening

Lots of fun ideas, though I can't see it going for world domination, but could see it ending with the lion and badger being moved together into a large warehouse when they both can no longer get out of bed, so they have room to keep being fattened up.

Might be fun if this started as a plan by the badger to help his friend live his dream, but it went out of control for both of them.

I've written more then a few fattening stories, so you might want to check out my stuff. :)

Dragon piloting a long haul space flight. The trip will takes several weeks/months. Not much else to do but eat.

A goodra comes on a stage in a specialty club to entertain folk. She is large, and calls an audience member who wants to be admired, too, to be fattened and prettied up.

A Lucario slime inflation with a the side fact of pregnancy

This is actually... a really. really good pitch