You know, based on this it would be cool if the forms could be brought up in the actual gameplay and any you unlocked you can click and say "transform" so she turns into (form you unlocked already) without giving her a million Cup Of [Drink] again if it's a spam one.
Also, ones that AREN'T combinations that have a sex scene have a little heart symbol on the word list, but it should definitely be on combo forms that you don't use only one cup for.