Mikan's Links
Mikan feels responsible for Yuzue, and still sees him as a little kid. She doesn't mind Yuzue fooling around, but will still keep him in check if he crosses the line. They two are very close to each other.
Yuzue is very protective of his older sister, Mikan. He'd rush over in a sec if he thinks his sister is in trouble, and will do whatever it takes to help her out. They two are very close to each other.