Swapping and stealing traits, like breast size, weight, or height.
http://dexsin.com/BoobjitsuMatriarch.html
This game has some attribute theft in it. A character named Gaia gives you a quest that allows her to steal tits and ass from a rivaling clan. There's also a quest at the end that allows you to steal all the curves from the rival clan, but for some reason its been bugged on my end. Let me know if you manage to finish to quest for Gaia in the Ruins.
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Fuck forgot image
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It's too bad this kind of stuff is rare. I really love it but most importantly the stories full of breast envy and how the girls adjust to their new figure. It's also really cool when it's a girl who'd get bullied because of her looks and then she becomes the bully instead.