Recss

Flawless
Our relationship is...
Reimei no arcana
Ou no kemono
Miss not-so sidekick

Have you tried any of these series yet?
The Princess Imprints a Traitor
Under the Oak Tree
As Long As You Like It
The Broken Ring : This Marriage Will Fail Anyway
Death Is The Only Ending For The Villainess
The Girl Who Married the Big Snake

Not quite romance marinators but they do got some angst in them