She holds eye contact one beat too long, then goes back to stirring her drink like she did not just change the room by half an inch.

There is no dramatic smile after it. No cute line to explain it away. That is what makes it annoying. Across a table, in a hallway, at the end of a goodbye that should already be finished, she lets the look do the risky part and then steps back from it.

He has to decide whether it was on purpose. She gives him no help. Her phone lights up, the glass clinks, someone else starts talking, and he is still replaying the stare.