Books to feed my need for Souls in Ruin sequel

So, for context, I just finished reading Souls in Ruin by Jacqueline White and really liked the book.

And I did not pay attention to the fact that it's not a finished series, now I'm dying because I have to wait

Until there I would really appreciate some recommendations of completed series, or standalones that can fill this void 😆

Themes:

• Dark Romance
• Morally Gray MMC and/or FMC
• Forced proximity
• It can have some type of imprisonment of MMC or FMC (kinda like the dungeon in Souls in Ruin)
• Spice moderate or high
• No matter if it is slow or fast burn

Thanks 😊