Mods

Ah, something different. Your friend did say you were a psychologist. So, let me run this back:

You want Rias to act as the maternal center of her peerage and anyone she "adopts", with her breasts and thighs growing to reflect this. Her personality is more mature, able to handle most situations without losing her composure.

Akeno leans into her Onee-chan personality, while still retaining her sadomasochist personality, her sadism only comes if people try to hurt her "little sibling", while her masochism comes if the little sibling comes onto her. Her breasts and hips also grow slightly from her anime counterpart, but aren't as big as Rias's new assets.

Koneko takes on the personality of a little sibling, gradually thawing out and talking more around her "big sibling". She will still have her cat ears, but they're retractable and she won't show them in public. Her frame will stay mostly the same, but it should be noted that any model can be further customized later for a small fee.

Their magic can't be replicated, but all models will be stronger and faster than your typical human. Koneko is even stronger due to her Rook, while Akeno is both stronger and faster due to her queen.

Does that complete you order?