A character from muneneko, https://twitter.com/muneneko , a very interesting and top-heavy character.
Updated for flux - it's flexible at 1 strength, although it does want to make her chest a bit smaller...
Weight seems to be best around .9, and seems to be decently flexible. Works well with Animerge, with some testing on some more realistic base models.
Using the keyword kisame seems to enforce the features better in realistic models, but it's not strictly necessary.