Guy who has a viewer based gender and sex.
To you, he has the (well, a) gender and sex and presentation that you don’t.
You’re a man? she’s a woman. You’re a woman? he’s a man. You’re non-binary? So are they, but in a different way. Whatever you’ve got in your pants, he/she/they don’t.
You met her a few years ago, and she seemed nice. But now you meet him and say “oh, you transitioned… I didn’t know you were trans!” He smiles and says “I’m not. But you are, so…”
when he/she/they have a threesome with two people of different genital configurations (regardless of gender), it’s real weird to see. One of you can see a vagina, the other sees a penis.
if you ask him what pronouns he himself prefers, he says the ones you don’t use.
But you’re pretty sure that’s not the gender-perception magic, he’s just playing along and being coy. you can tell from his smile
He’s got a twin sister, who looks a lot like him, but she’s got the same gender/sex/presentation as you.
Annoyingly, when asked about his pronouns, she says she can never keep those straight, but any pronouns are fine for her.
So, if the original person is the opposite, or at least different gender than the person perceiving them, and the “twin” is the same gender as the person perceiving them, what genders are they when they perceive each other?
the same gender twin says “they’re the same as me” and the opposite gender twin says “they’re a different gender to me” and can’t be nailed down to specifics.
What they actually see, if anything, is between them and God.