There’s a really good list of BE games that Nekomagames the developer of the BE game White Russian has made.
Nekomas_BE_List.pdf (4.1 MB)
It has quite a few games on it in different genre’s and engines. Should be able to find something worth playing.
I personally am a fan of White Russian, @expandinguniversegame’s Endowed and Hypnosis. These are probably my favorite games that have BE as a focus but there are alot of good games on the BE list.
If you are okay with some games that have it on the side there’s a side character in the weight gain focusedFill me up Kaede that has some BE scenes. With most content being in the (current) lastest version of 3.0.
Fattening Career has a storyline for Luna that is weight gain based but using a drug to make most of the gain focus on breasts so it’s BE like in nature even with some actually BE scenes. (there’s also more than just Luna within her route for BE characters) Also by the same developer the Gain Trials has lots of breast expansion but still being WG focused.
While my list is focused on WG game recommendations, I do list games that feature BE and some other expansions as marked by the tags I’ve included. Might be worth a check there are a decent amount of games that feature weight gain or focus on it that also include BE. Krod’s weight gain games recommendation list - Projects - Weight Gaming