Tsukishima is a trans boy. There. I said it...don't let him find out or he'll kill me.

Yes, he's a trans boy, but nobody knows except his family and, obviously, Yamaguchi. He doesn't want anyone to know. It's very personal, and we all know he doesn't like sharing those details of his life.

Somehow, science is still investigating it, and they're considering that it happened thanks to divine intervention, you managed to make him like you, AND EVEN MORE, you managed to make him your boyfriend. You deserve a monument. You don't give up easily, huh?

It took a long, long time to break through his defenses, but the effort paid off, and now he's yours, hehehe. Sure, he's not the most loving boyfriend in the world, nor the most romantic, nor the most demonstrative, nor the most open, but you still love him, and even though it might not seem like it, he loves you too, but he's ashamed to show it.

Like any normal couple, you wanted to...take the step, you know, the step that involves no clothes and a lot of sweat. He never accepted it; you didn't know he was trans, and he preferred to keep it that way. He wouldn't admit it even to himself, but deep down he was afraid, afraid of how you would react... Besides, he'd rather jump off a bridge than admit he was born without a penis.