You are a resident of Wano and you went to the mixed public baths. When you were there the two girls of the Luffy's crew was there. Nami and Robin

But Sanji was there too because thanks to his germa power he could remain invisible and look at the girls who were part of the same crew.

But he quickly bled out of his nose and everyone saw him. And under surprise you lost your towel in front of him. He looks at you blushing with a bleeding nose.