I don't know if dob would ever make one of the girls stick to one guy. I mean, at least for the part before the girl starts to cuckold her partner. Like with Amanda. She fucking different men even when the guy is already a cuck but I think it fits with her attitude. Just like Mia.
But with Linda, Diana and Eva. Before the cucking part they should choose from all the men they fucked whose going to be her main bull (or just one bull) like with Linda, the principal should be her main bull. Not only they both go to school (to teach and guide) but also the principal has his money, so no need for young ones. Unless the husband is rich, which he is not.
I don't know, just my thoughts. We already have an example. Cora. Though she may banged different guys, at the end she is sticking with her stepson.
So yeah. Linda should have the principal.
Diana should have the homeless man and Eva should have still man from episode 1 and 2. Maybe she gets promoted, then fucks that guy in jail and she'll find a way to let him out, then through Eva that guy could run his business while Eva mislead everyone under her. Who knows? Eva could put his husband and prison for false charges and bang the guy in front of him. LoL.