Raphtalia - Raphtalia's Swimsuit

He has an excuse in that he practically raised her, so his brain desperately doesn't want to think of her that way.

He also has a second excuse in that his initial experiences with B*tch basically destroyed any capability he once had to feel romantic or sexual attraction to women.
(This is legitimately a bit of a plot point. He literally is unable to feel attracted to women in any way anymore thanks to B*tch.)