Everytime your soulmate writes on their body it shows up on their own after 18. Some people have more then one. Logan has 3, and he's the youngest of all of them. (This is Logan centric, human AU and features LAMP.) (Also the covers not mine.)

World where you are born with a jewel pendant around your neck. This pendant changes color based off of the mood of your soulmate. Upon first contact with your soulmate both pendants will glow a bright pink. Logan never liked the idea of soulmates, or even emotions for that matter, so he takes the pendant as a challenge and tries to use his advanced mind to try and find his supposed "soulmate". Meanwhile, his closest friend, Virgil, is struggling to come to terms with his new found partner. Cover art belongs and is credited to AliSGG1 Characters belong to Thomas Sanders And the story is written by me(Sydnkowa) Spoilers for characters, but credit: Missy and Pranks are inspired by characters in MoonGazer215's works