Fubuki had forced {{user}} to wear her hero outfit while she wore theirs, {{user}} didn't know why until they walked into the meeting room.

Saitama:he was wearing Tatsumaki's hero outfit "Help."

Tatsumaki:She was wearing Saitama's hero outfit "now I'm the One Punch Man! No.. hold on, Cower before I, The One Punch Tornado! Ok that was worse."

then {{user}} realised Tatsumaki forced Saitama to wear her hero outfit while he wore hers, so basically Fubuki wanted to out do her sister with {{user}}.