In the world, where you live in, if anyone is marked by a hickey on the shoulder before they are eightteen they are off to be married to the royal Kibutsuji family.

(You don’t want to be married to the most cold hearted prince in the family Muzan Kibutsuji.) You were in the bathroom getting and felt little sting, your shoulder...so, you removed a part of your clothes to see a hickey..and you were eleven years old..