A lot of the rules about Light & Dark seem to have been totally ignored. Bo & Dyson totally got busted for crossing party lines during their recent hook up. That fits with a lot of what was established way back in Season 1. But after the end of "La Fae Epoque," everyone just seems to forget about it.
Actually they didn't get busted for that. Bo initially believed the Una Mens were there to punish them for "crossing party lines," but in fact they were there to arrest Dyson for Flora's murder, leading into "Epoque."
Dyson & Bo are now kinda back together with hardly any fanfare, which doesn't feel right. Bo & Lauren aren't together right now but the show can't really come up with any convincing reasons why they aren't.
Bo and Lauren are back together; we just aren't seeing it much. Technically Bo and Lauren are a couple, but it's not an exclusive couple due to Bo's succubus nature, and thus she's started fooling around with Dyson fairly regularly again. And the writers' focus seems to be more on exploring how the relationship between Lauren and Dyson is evolving from rivalry to grudging respect to friendship.