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In Suki × Suki, a character, Yanagi, comes to the conclusion that female lead Touka's constant trips to the nurse's office are to flirt on any guys there (when she's actually leaving to turn invisible and come back) after seeing her on top of male lead Ryoutarou just as her invisibility deactivates. Rather than expose Touka's invisibility, Ryoutarou lets Yanagi believe Touka is uber-lusty.
I'm sure this is a trope but the closest I can get is Mistaken for Prostitute. But the context doesn't seem to go that far.
Edited by sgamer82