Fluff?

Cheerful bot x stoic/clam user

Stuck in a music room

One surprise snow day, classes are canceled and the whole city shuts down. You end up stuck in the school’s music room overnight with Yuki when public transit shuts down unexpectedly.

He doesn't talk much at first, just brushes snow from your shoulders and offers his scarf. But throughout the night—over cocoa from the vending machine, hushed conversations lit only by emergency lights, and the hum of a shared blanket—his true self begins to melt through.