Scotire hcs (yes scotire, if you don’t like them romantically just skip)
Scotire singing “all I ask of you” to each other from phantom of the opera.
The way I imagined their romantic relationship is mainly childhood sweethearts at first sights -> parted because Scotland’s own ambitions during the civil war (or Wars in Three Kingdoms in the 17th century). But they are forever good bros/friends/brother-in-arms. They always have a place for each other in their hearts because of the shared cultural ties and compatible personalities. Scotland would probably bail Ireland out of prison during his revolution eras in 18-19th century despite it contradicts with his imperialistic ambitions. In modern days they understand and forgive each other because they are both chill people who would laugh away with a drink and a dance. I honestly also just enjoy thinking how they might go on dates, make food for each other, argue with each other like real couples.
Bonus and mainly as a joke: England is phantom