Viktor is probably the kind of person who, when he’s mad at someone, he’ll completely ignore their existence and just be really fucking petty by talking to everyone except that person.
And the first time he and Yuuri get into a serious argument, Yuuri is just really taken off guard by it because he’s so used to Viktor hanging all over him.
But he knows he’s the one at fault, so he tries to give Viktor space to be upset for a while.
And later that night, they still haven’t made up, so Viktor decides to sleep in the guest room.
Only he has a lot of trouble falling asleep, because Yuuri’s not there. And after a few hours of tossing and turning,he decides to get up for a glass of water.
On his way back to his bed though, he hears something from his and Yuuri’s bedroom and, worried, goes to check it out.
So he opens the door, and there’s Yuuri, curled up in bed, and his shoulders are shaking, and he’s sobbing quietly.
Viktor’s heart stops.
“Yuuri! Are you okay?” he gasps, running over to the bed and drawing Yuuri into his lap. “What’s wrong? Did something happen?”
“I-I missed you,” sobs Yuuri, clinging to him tightly, and Viktor feels his heart shatter because oh no, he’d never meant to make Yuuri cry.
So he spends the next hour comforting Yuuri and whispering apologies to him, and in the end they both fall asleep in the same bed and Viktor spends the entire next day absolutely spoiling Yuuri rotten.
And from then on, whenever Viktor is upset at Yuuri, he’ll grumble and make petty jabs at him and be extra difficult and obnoxious, but he never outright ignores Yuuri the way he did that first time.
Because even when you’re mad at someone, it doesn’t mean you stop loving them, and Viktor would sooner cut off his own legs than make intentionally make Yuuri cry like that again.