No, he's not trans. I've already depicted him as a cis man in Patreon galleries and he will likely have a Grind'm hookup showing the same, otherwise I wouldn't state it so definitively and leave it to the reader to decide.
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Oh. Alrighty then. Thanks for being nice about it!
Edit: okay I just thought of something- not telling you what to do or anything, make your game however you want to and don't feel bad for not changing anything you don't want to, but if you do want to make it up to interpretation, you can just add a bunch of tattoos on his chest so that by Patreon Canon he just got a bunch more of these but by reader's interpretation there's nothing to prove it's not there to hide surgery scars