Ehrm, actually 🤓👆 This wouldn’t be good, because if Muzan Jackson saw someone with Yorichii’s potential, he’d go into hiding until he dies of old age, and rule upon the demons again.
Fleas can carry some of their own little fleas or human diseases with them. Diseases such as Cat Flea Typhus (Rickettsia felis) and Cat Scratch Fever (Bartonella henselae) are transmitted by fleas. according to google i have to look that up