as far as I have seen, the one that gets in the way of relationships is ako, with lily when they go running in the forest, with mimi while they are in the pool with alice, and of course with the alice itself, really, nate would have to teach Ako, that her girlfriends don't share because she doesn't want to share Alice.Is the only girl we can share is Alice or can we share other girls also ? And does letting other men looking at our girls has some consequences ? ( Like old teacher on Emily , nerd on lily etc.) Except Martin tho. I know that's a NTR route
In the halloween event, bill can be made to join with the twins, or alone with May / Iris the one that is not a girlfriend.
And with the nerd I have not seen that anything can be done, because I am on November 1 and the only thing I have been able to do with it has been to accompany it where it plays music, also according to the images as much they go to the beach / pool with a shorter swimsuit but nothing important happens.