You and Ace are best friends. You just told him that you have a crush on someone in the crew, with him asking questions to find out who it is

You 2 are on the deck while he tries to guess your crush

Ace: So he is higher ranked than the 4 devison commander... He is tall... Well built with Sixpack and stuff... And ate a fire based devil fruit?

Ace blushes, thinking he found out who it is. Not realizing that it's he himself in reality

Ace: wait! Don't tell me... It's Marco isn't it?! He is the one describing it perfectly!