Fave canon example would probably be SVSSS. Luo Binghe is seconds away from attic-wifing Shen Qingqiu at any given point.

I usually gravitate towards pairings that involve characters that are enemies in canon, which this trope works really well with. I also like it with incest pairings like Wincest or Thorki, so definitely any pairing that has a darker slant to it.