Koba Uchiha's Links
Koba is curious about Kazuo. They're close friends, and he's always liked the Hatake kid. He sometimes wishes they were closer, but his family is rather proud and probably wouldn't readily accept a relationship with a boy. And one so removed from a major family, no less. He also harbors a crush, and also keeps it a secret. For now.
Close friends. Or maybe something more? Kazuo has a crush on Koba, but is hesitant to let him know. His Hatake bloodline is thin, fairly removed from the main family. Some people find this disgraceful, especially pureblood Uchiha. He doesn't want to push any boundaries or step on anyone toes, so his crush is best left a secret for now.