The extremely short answer is no. There is precious little masculinity in any of us. I know cis-women who are more masculine than I am. I was surprised by how many of the gay men who used to fuck me pre-transition have zero interest in me now.
The longer answer which is me answering you question with more questions is why would it be gay and why would you care? If you are into her enough to let her inside you why the hell would you care, even a little, about societal constructs? Gay is just a label that allows us lazy people to identify a broad group of sexual interests. Labels like these tell you nothing else, like nothing at all, about the person beyond that. It's useless honestly.
Hope that helped a little.