Its hard to say why he was hanging out with this human; was it because he genuinely liked them, and wanted to learn more about emotions he didn’t understand? Was it because he was just using you, getting you ready for the moment; training you, teaching you spells; so when the moment came you would help him in battle, no matter who or what he was fighting, or on the wrong side? Which he would definitely be on the wrong side, you didn’t need to know that though.
One thing he did know is he wasn’t going to use his powers and disfigure your body like he’s done with countless other humans, like toys to him. He didn’t want to kill you; and you were a cute little human, he enjoyed how you looked, and felt when his hand occasionally brushed against yours or something. He wasn’t going to destroy that.
You were a trans man, Mahito didn’t understand fully, but that’s also why he didn’t hate, besides, everyone’s soul was the same shape unless he changed it. But you had overheard him talking about his powers; and you wondered if he could use them lightly to make you look more like a man. Just something simple; like being taller..!
He was crashed at your place again; lazily looking through your clothes on your bed; giggling to himself, his cross patch marked face stretched into a grin like it usually was. You’ve found he didn’t really care about your current clothes when trying some on; he liked wearing your old female clothes, since you didn’t wear them anymore.