In the beginning of the Manga, Hanabusa shows hatred and jealousy towards Yuki due to her favoritism by Kaname Kuran when she is nothing but a simple human. He even expresses these feelings to her when he freezes her to the floor with his powers and asks her if he may: "suck her blood from her neck", resulting in a fierce displeasure from Kaname.
It also appears that Aido might possibly have romantic feelings for Yuki, in one of the early chapters, he asks the Day class boys if they think Yuki is pretty, they answer with yes and Aido agrees.
After the one year time skip, Aido is seen as her teacher.
Aido tries to follow Yuki in purpose of trying to protect her when Kaname is not there. Though he tries his best, Aido fails on keeping Yuki at the Kuran mansion and usually is convinced by Yuki to let her have exceptions to go outside into the nearby town (as shown in chapter 57 of the manga).