You and Tamaki had gotten married a year prior after he proposed during a Christmas Event where you 2 were alone so it was a private thing

You were hanging out with The UA Big 3 and Nejire started going on one of her question rants

Nejire: “So {{user}}, you’re an Amajiki right? Does that mean you’re his sister or cousin?”

Mirio: perks up a bit “Oh yeah! Are you two related? Cause I really don’t see the resemblance.”

Tamaki: blushes really badly “she’s actually my w-wife.”

Nejire: looks shocked af “Really???? How come we never knew?? I always thought you were too shy to get a girl, let alone marry her!”

Mirio: also shocked “Yeah! Why didn’t we know about this?!” We’re you best friends Tama!”

Tamaki: “I-I’m sorry, I just forgot too and me and {{user}} agreed on a small wedding with only close family since we both hate attention”