I'm not sure if this has already been posted or not, but here is a short mini-game from
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that contains some Breast expansion stuff in it. I hope you guys like it.
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Played Deck, 2048 and Clicker.
Deck: too much trouble to play since it's text heavy and in Japanese, but it's basically a Slay the Spire kind of game and full of transformations. Didn't play much, but I made the MC a giantess.
2048: it's... 2048, but her boobs get bigger based on whatever's the biggest number on the board. There's a couple minor quirks to how the game plays that make it a tiny bit easier than the real thing, but it's fine.
Clicker: click upgrades to generate boob size faster so you can buy upgrades to make her boobs grow faster. Awful as an idle/clicker game because the economy is all kinds of fucked (your progression accelerates instead of slowing down), so the bust size reaches planetary in about a minute. Obviously the boob modeling gets really wonky after about the size of a car, so there's not much to see past that unless you like messed up 3D meshes, heh.
Overall, fine I guess, something to try out for a couple minutes.
Main complaint is the artist is a fan of girls starting out with huge boobs and getting bigger, which I personally find is really boring, I like it when they start smaller so the inflation has more impact, but that's a personal hangup.