Kateterpeter
That's not easy to recommend... See, the idea of this game is "still" in a majority a freeplay type of game. You have no "bad ends" leading you to END GAME screen, and also do not need to "fight" any foe, other maybe than in one Vivarium scene, with a knife (!).
Also you have somewhat a freedom of movement, can revisit majority of location later in time. Yes i know that this has no meaning without "replay" scenes, however still...
And another one is a paper-doll system with clothing dependent on body parts transformations (like: breast expansion).
This mix makes any game recommendation very hard.
All of above - beside "transformation" - have no real tags on this forum, and i mean:
freeplay
no fight
no bad endings
paper-doll system
If, just "if" there would be tags like that, adding them to already used tags into search would probably return no results.
However if you can stomach fighting, still you could try: