I just realised that every time Yuri performs his Eros during the Grand Prix, and he wears his fully black outfit,
Viktor is wearing a black suit with a black tie.
But when Yuri does his Yuri on Ice performance, wearing that blue costume,
Viktor wears a blue-ish suit with a blue tie. What I’m implying is that Viktor totally wants to match with his boyfriend and I find that adorable and hilarious.