ML always gets flustered when he's with the FL

Maybe because she's too forward, or she's too ignorant of the difference between men or women, or he's just too shy, or serious of a person, or something like that.

And maybe he reacts in a panicky way and gets clumsy and always ends up hurting himself.

• Nigeru wa Haji da ga Yaku ni Tatsu (the FL says/does some things that fluster the ML, he's also shy)
• Gomenne Seishun! (the FL is too aggressive while the ML is more passive)