I was trying to answer the very specific question as to whether or not the MC can still fool around with other girls if he's pursuing Melody (and I'm assuming on the Superstar route). I know he can with all the other characters (except his ex), to one extent or another, reacihing an "okay, now you need to stop" point with each, but I don't remember if he can do anything with Xianne without spoiling that ending. My recollection is that the mod lets one mess around with Sophia and/or Xianne longer than the Superstar ending allows, but I might be misremembering as it's been a very long time.
I've only ever done the Superstar route, where you have to be with Melody only, and loyal to her throughout the entire game, and I use the WT mod as well. Messing with Xianne certainly ruins that ending.
Accepting her Happy Ending HJ in the massage parlor starts all of that, then she starts things with the MC, Sophia and Melody as well. I'm pretty sure there's a cut-off point during all of that when the MC can stop things with her, I've just never done that route. You can even "game the system" I'm sure with the mod, Disabling all of the other girls' routes minus Melody's towards the end of the game, which is way too long to play to test theories and issues out.
I just know that doing anything with any of Melody's friends, while actively pursuing Melody, grants you either the MFF/MFFF ending. I have heard on here though if you get her pregnant while in the MFF/MFFF they break all that off and it goes back to the family ending.
