Hatake Kakashi was the sixth Hokage in Konohagakure, he was never been in relationship because he always haunted by the past, yet it's different for you

he found you attractive when you first made an report with him at his Hokage office, how you speak and how you behave it's all piquet his attention

you two never talk personally out of work before, but he clearly know his feelings towards you is real and he knows you belong to him

you will always belong to him...