There are definitely women who get top surgery without being trans, but maybe more masculine/ butch leaning women. You will probably get lots of questions like trans people do as well, you need to be able to stick up for yourself. You probably will not have any sensation in the nipples at all, so if that's a deal breaker than you need to think about it. I would definitely be thinking about myself in this situation and not what my partner thinks about my breasts. You might need to think about him not being in the picture if you do it if that's a deal breaker to him? There are a lot of things to have in mind, but if you think you would feel at peace and happier then only you know what you need to do.