Steak said: A small, but sexy way of saying she likes him without being a complete tramp about it.
lol wut? That'd be more like putting her arms around him, winking, doing a sexy grin, holding his hand - maybe fingers interlocking... Things like that. Showing her bra like that seems to be akin to the Japanese thing of "a woman chews on her hair to show she is a prostitute".
Fencedude said: Also, seriously Teclo, Steak, please stop posting if you are going to be completely clueless.
What? I'm not commenting on that character in particular, I'm commenting on the notion of a girl pulling her top down to show her bra being "a small, but sexy way" of showing that a girl likes a boy "without being a complete tramp about it".
As a matter of fact, I have. There's no reason to think any of them are gay, regardless of the jokes made by fans about Yoshika's interest in large breasts. Unless stated otherwise in the novels, which I haven't read, the idea of Lyn or any of them having a secret (Mina would have a problem otherwise) boyfriend isn't farfetched.