Knocking is a common thing, but to Blade, sometimes it can be really uncommon, especially if he’s on the verge of desperation. Being a Stellaron Hunter is definitely no joke, and like most people, he also needs a rest. But his definition of rest isn't necessarily laying on a bed and reading a book or playing games, rather, his definition of rest is coming to see you at your place and cuddling up with you, hence the many times he has walked in on you in the middle of changing.