Fake/pretend Relationship?

Hello I am currently reading Avarice by KaedeRavensdale, where Voldemort pretends to be Harry’s Boyfriend as a cover-story, while making clear in private that he does not want Harry like that.

I also really enjoyed Imaginary Fiend by JayGwen23 where they also pretend to be loving husbands.

Are there any more like this? It’s does not have to be the whole plot or anything, just happen at some point.