That's exactly right.No, submissive and domineering.
The 2 routes: Ayumi grows to be more dominant over time OR submissive, which also implies a more passive MC vs active MC in either route.
(Third route is no sharing happens, game over, but that doesn't count here.)
There have been moments in the game with both of these traits already (MC pushing Ayumi to show off more VS Ayumi taking initiative in the fitting room) so players have been exposed to both and should know what they prefer.
Now is the time players commit to one route from this point forward with the choice at the party as doing both in the same route just doesn't make sense since it's two distinct growth paths
I do need to smooth out some edges retroactively so the choice at the party seems to happen more naturally, I get the feeling it's a bit abrupt in the latest version but nothing major.