The "others" path is already branching in this episode. Its not possible anymore to fuck everybody. And even after the Lily/Nicole Threesome you have to decide for which girl your MC has more feelings.
I think the branching here will become even more clearer during season 3.
For some girls that will not mean anything. For example... Mel and Sarah or some other sidegirls. There is not much going on between them and the MC, besides a fuck here and there. Dont think this will change.
Riona, Nicole and Lily are more likely to become a Love Interest with a solo-ending at the End of the game. For riona something like that already was hinted after episode 7 and 8... and developed even further during ep 9. They dont fuck around in ep 9, but you can show her that you care for her and want something more along the road, and opened her mind for that too a little.
Nicole is clearly showing that she wants something serious someday. Lily deflected that, but its kinda obvious that she already likes the MC way more than she wants to show... she warns him not to fall for her, but you dont "warn" somebody if there arent already feelings involved.
Now its just the question what DPC has planned for them... maybe there is no soloending possible with one of them, cause her fate is already decided.
A full on Official-Girlfriend-Love-Path will not be a thing though... not like with current main-LIs. But i guess there will be some endings with a sidegirl... Nicole, Lily and Riona are already the "main"-sidegirls. All the others are way behind in screentime. So i think all three of them will get a unique ending depending on the choices made. Happyendings? Thats a whole other deal though.
If i had to bet... Nicole will get a solo-happyending if you want to be with her in the very end.
For Riona i sense a somewhat dark ending... not Acting Lessons dark, but maybe she will get setup by Quinn. Riona is already framed for the moneyloss by Quinn. The friendship between Quinn and Riona will end, the Question will be... can Riona get out of the whole thing clean, or will she take the blame for it and has to deal wit the consequences. Here might be the MC a helping hand again for her... i think you have to decide on which side the MC is in the end here, either for Quinn or riona. And MAYBE this can lead to a happy ending with Riona, but i dont think so... MC and Riona will not be a couple (yet i hope otherwise, Riona is my favorite sidegirl), but MC can help her in the end so she can leave the college happy on her own.
Lily and MC will not be a couple either... i think she has a very good reason to warn the MC not to fall for her. (no not the undercover cop bullshit, something else i dont know yet) Yeah she already has some feelings i think, but she knows that it will not work out. The reason for that is not known yet.
Anyways... i think at the end of Season 3 we will have to decide anothertime like we already did after episode 8. Its clear that we can lose or breakup with our already chosen girlfriend. Like we saw with Bella and Jill if we have feelings for both. IF you are on Bellas path at the end of ep 8 but still on Jills path... you can go for Jill (or better said she will go for the MC and fight) So there will be choices to make. And so for some girls out of the "others" path too. Here i think you have to make a choice for either Nicole, Lily, Riona or Quinn. Or you deny them all and go for a single-fuckaround-route again.
For other girls than that i dont see a somewhat route coming... not even Camilla. There werent enough serious scenes with her or other girls so far, and it is to late to establish something here i think. Fucking around, a little bit "like like" here and there maybe... but not more... no Girlfriend-material.
Of course... Zoey will get a full on Girlfriend route along the way. But that was of course obvious so i didnt really mentioned her in this post.
I sincerly hope there will be a good Riona Ending, but i have my doubts... a full-on Girlfriend route like we have already with the main-LIs, i dont think so... more like a "going after her and getting her in the very end" thing.