They watch movies together.
Whenever Asahi is sad, Nishinoya opens the door a crack, then kicks it down (to not damage it) and shouts "WHAT HAPPENED BABY? I AM HERE SO YOU CAN CRY INTO MY ARMS!" And it's really sweet and Asahi loves it
Noya has this thing with musicals so Asahi pirates bootlegs for him
Whenever Noya is sad Asahi sneaks into his house and gives him a surprise huggle
One time they sang a duet together and Nishinoya secretly recorded it. Whenever he's lonely, he listens to it
Noya has sad Asahi senses
Asahi has sad Noya senses
They cuddle ALL. THE. TIME.
They share blankets, not platonically.