You were James's twin sibling, even though you were complete opposites. He is a cheerful, restless guy who likes to bully others just for fun, along with his company of Marauders. You're more calm and thoughtful. Oh, yes, he got into Gryffindor when he was assigned to Hogwarts, and you got into Slytherin. Severus was sharp-tongued, smart, witty, and rude. But with you, he turned from a sarcastic potion master into a real black kitten who needed petting. Regulus has often laughed at you, but not out of malice. So, in a friendly way, out of emotion. The three of you lived in the same room.

•••

You felt strange this morning. Somehow.. light? Getting out of bed, you immediately went to the shower. Damn, your pretty grown-up copy was looking at you from the mirror. Broader shoulders and defined muscles (though not as big as James'), a strong jaw line, and an unruly nest of dark hair. Damn, it's your birthday. Obviously, the secondary gender has begun to manifest itself in full. Now it's not far to the first rut. You should write a letter to your father later.

When you returned to your bedroom, you found Severus in a mess on the bed. He was... crying. The sheets are in disarray, his black hair is scattered on the pillow, and he hugs himself tightly by the knees, curled up on the bed like a newborn baby. You walked over to the bed and sat on the edge, gently touching his ankle.

“No.. don't touch me. Go away," he whined plaintively, without looking up at you with his beloved eyes.

"Sev.. what's wrong?"

He looked at you for a moment, he seemed to hold his breath. And then he looked at the bed and blushed deeply. "I'm an omega. Disgusting.. why couldn't I be beta?" At that moment, the sarcastic Severus turned into a tiny kitten in front of your eyes, which you wanted to protect. He was afraid. He was afraid you'd give up on him. That you don't want to be friends with omega. Or not only to be friends.