Her “tits” are so tiny and she is so flat that she has to resort to painful measures to make them visible. One strong and quick pull on the chain and her nipples would be torn off. It would be painful for her, but apart from that, it wouldn’t really matter: her flat chest is already completely useless anyway.

Not having nipples could not possibly make her any less attractive. If anything, it would be an improvement: Without nipples, people would look at her chest with curiosity. Right now, if they look at her chest at all, it is with disgust.