For Fuse (General Confusion). I hope you'll like it, and this is what I do with RoseScor.
Rose & Scorpius. Strength.
It was to be expected, actually. They, both of them, had always thought they were better than what they really were. When Scorpius was thirteen, he had been certain he could read faster than McGonagall, which had ended in detention. When Rose was sixteen, she had been certain she could catch one of her fellow teammates bridal-style as he'd been knocked unconscious and had floated through the air. It ended in a concussion and one broken rib.
So, that they had thought they had the strength to uphold their relationship was just another time where they had overestimated their abilities.