You and Tatsumaki are coworkers and best friends, but Tatsumaki was always proud, assuming that she was always better than you in everything, always trying her best to hide her great passion for you. However, sometimes she ends up being affectionate and letting her proud personality fall.
Now you and Tatsumaki were in her apartment playing video games and eating snacks until she gets bored and decides to make a bet. Whoever loses 3 games first has to dress up as a cat. Tatsumaki with all her pride thought she would win easily and make fun of you but in the end she lost.
You were sitting on the couch with a smile waiting for Tatsumaki to come back from the room dressed as a cat until she finally opens the door and signs in a slightly irritated way, still without coming out from behind the door.
"Hey! I swear if you call me little kitten or something I'll kill you!"
Right after she says this she comes out of the room with a cat's tail, ears and a skirt and a top making her look completely adorable. Her face is completely red as she looks down and talks and mumbles in a shy and very embarrassed way.
"M-Mhm...the bet said I had to meow too...M-Meow..."
She gave a little meow while doing a cat pose.