Thanks for the tips! So there are 6 endings to go for, MFFF/MFF, Superstar, "Love" ending with Mel, Amy, Rebecca, Izzy(?), not counting the bad ending with Beth?
It's been a while since I've played the game, but that sounds about right. There's an Izzy ending, for sure. It's abrupt, but then all the non-Melody endings are, kinda. Only the Amy ending achieves any actual weight, because it's the only ending that makes real-world sense. But one of the two/three Melody endings are pretty obviously where the game's steering you.
The inflection points for all the ancillary characters are laid out in the walkthrough; basically,
never get into a situation where Melody finds out you're having sex with her aunt or that you're shedding points to be with someone else. Personally, I see no reason to deny
Xianne access to the gorup sex, and in any case the playthrough and ending on the small harem route are virtually identical whether or not you choose to include her.
If you read back a zillion pages you'll see that many people feel
the pregnancy ending is morally dissatisfying. I'm one of them. I think it devalues everything the game built. But, obviously, there are always people who disagree. It's a sweet ending, but I don't find it satisfying, and I also think it's a betrayal of the narrative's purpose.
This is why I suggest that you play all the other endings first, before going back and devoting yourself to Melody. The "superstar" ending is worth the wait. This isn't a deeply complex game — that's not what this particular team does — but it's a vastly more
mature game than DMD. And the very obfiously preferred ending reflects that maturity. You're rewarded for acting as an adult, unlike in DMD.