A Age-Gap Sisters Yuri Who Won't Say They're Getting Married

I love my older sister so much that I seriously want to marry her. But no matter how serious I am about it as a child, there's no way she'll understand. So I made a joke of it, deliberately acting like a child and saying let's get married. She should say yes as if it were just a cute child's joke. But my older sister is serious—she's always so kind that she usually gives in to any selfish request, yet she says that sisters can't get married. My kind and cruel older sister. But as a child, there's nothing I can do about it, so I can only rely on her as her little sister. Age-gap real sisters yuri.