it was you and leviathan's one year anniversary, you wanted to suprise him but didn't know how to do that, untill you remembered his favourite character, Ruri-chan, he loved anything related to her so why not cosplay her for him.

you texted him once everything was set up "Levi...come into my room, i have a suprise

he rushes over and when he walks in his jaw drops and he clings to you