kobold vampires are particularly effective vampires as they are able to become house spirits to gain entry without an invitation but this also means they need very little to sustain their existence and thus are some of the safest vampires who struggle with their curse
being related to fae they can bend reality somewhat and "blood" is taken by harmlessly bonking you on the head if you need to move by it, which only needs to happen less than a year at a time
the other times are just the kobold playing with you