When, from the pov character's point of view, the LI's expression "goes blank" or they can't read their expression.

Ties into my love of repressed characters in romance

Ruck seeing Melanthe for the first time in For My Lady’s Heart is pretty memorable.

Also Zylar the alien meeting Beyrl in Strange Love by Ann Aguirre

Might be time to issue my yearly reminder of a possibly more useful test than the Bechel test:

1. Is your book/TV show etc. set in space?
2. Does it have pirates?
3. Are a goodly percentage of them queer?

Realizing Andor kinda got …3 out of 3?? not bad!? (Rebels = pirates, I’ll allow it)

Piranesi by Susanna Clarke