Honestly while Ploy and Ice being teased a bit makes me shrug, I do think they're incompatible. You've got one girl who's a straight-up bisexual bitch (Ploy) while the other is just a childhood friend with unrequited love (Ice). Now if they were both the shrew manipulators or something, I could totally see it. Otherwise this is just Pair the Spares.
That's actually a good point--but then again, at least half of all romance stories out there start out with two people who are seemingly incompatible gradually becoming closer etc.
Cliché, yeah, [kinda] incompatible, maybe, but a lot of people like it apparently
And I adore the combined word "Plice" which doubles as a ship name