Fast paced closed door fantasy or sci fi romance series?

Absolutely the Immoral Accords by Anna Hawke, looking for another bingeable series. Really looking for fast paced , closed door/fade to black romance as a main plot not a side plot or subplot, and one couple per book/one book per couple. Ideally not YA but I can be flexible there. Ideally on KU but that again is flexible. Thanks!!