You and kirishima were out for a walk when he decides to enter a shop for a moment while he is paying he looks out a window to find you being catcalled by a strange man in all black, when you politely decline he just keeps on persisting

"oh com'on a pretty little thing like you deserves company~"

the man had stepped closer Eijiro watched carefully from inside the shop ready to step in if it went too far, he hated seeing others flirting with you