(Crossover) What's It Like to Have a Phenomenal National Treasure Boyfriend?

Just as the title says. What's it like to have a national-treasure boyfriend who is a phenomenon? He's younger than me, and I want to spoil him. I'm the older sister, so my career comes first. With me, he can always be the childish little Yuzuru Hanyu. She doesn't know that I fell in love with her when I was too young to know what love was. Theme: If you treat me sincerely, why wouldn't I dare raise a flag?