You don't even need a translation to understand what Nico's upset about here, hahaha.
What is this!!Fine! I get it! It's okay if I do this!!There's nothing here.Where are your breasts?Nico-chan...But I can't see anything at all like this and really who does this sort of thing!?It's embarrassing for you to look so you have to wear that!!If you take it off I won't let you, OK!?