There's so many characters now that poor Runey working on everything all alone can't prioritize one particular thing over another. E.g. Jin has gotten nothing for so damn long, but then personally I just want more with Moon, Hana and Nia.
One idea I would like to see implemented, inspired by the Ashley & Felicity threesome event, would be a customizable threesome or even foursome with whoever you've reached a certain Friendship and Sluttiness with, but holy wow that would be tedious.