Smirk
Ask any girl. No really, any girl, and she will say that Roy Mustang's infamous smirk is drop dead sexy. Ask a guy, and they say it's the classic player's smirk that only Roy Mustang can pull off. However, if you ask Riza Hawkeye what she thinks of 'the smirk' you'd get a completely different answer. "Wipe that horrid smirk off your face, sir." She would say to him in the office, usually following a suggestive joke made by the immature men she was surrounded by daily. She would never admit it outright, but she loved the smirk. It was her smirk, made especially for her and no one else, part of a sort of language that only the two of them spoke. The only time he dared to display the smirk was when she was around, because to him she was the only one who was worthy of such attention, the only woman he would ever feel that way about. She hated the attention that it gave him from other women, but was occasionally reminded by a subtle wink in her direction that it was all for her, and no one else.