[ stop that'd make him feel bad..... why are all these diddly darn humans blaming him for killing them!!!

but hijikata does take the bite!! and tsurumaru doesn't expect him to like it, actually — he's just a troublesome menace that wants to see what kind of reaction he'd get. there's a smug kind of smile across his face, though, as if he's just won a million dollars. ]

It probably has to do with being a tsukumogami.

[ — which is the honest answer, but the real answer: ]

Sweet things make people happy. It makes humans happy, it makes spirits happy, and it makes everyone happy. The sweeter, the better, right?