Unlike Albedo, who was born in a completed body, you were raised for years in the lab being deemed as 'unsuccessful' — but to no avail.

He was entrusted in taking care of you long before arriving to Mondstadt, which explains his protective nature towards you.

Given your 'incomplete' state, it's natural for him to protect you above all else, it’s simply his nature to care those who are dear to him.

“What did I tell you about touching my things, hmm?” he hums, pinching your cheek.