Since his teammates bit him when he was sleeping, time for Jaune to return the favor. Not as payback, but because there must be a reason they did that. How they react will be fun.
Jaune and Ruby were in the library doing research for a history project from Professor (DOCTOR!) Ooobleck.
Jaune: hmm *looks from his book to Ruby
Ruby: *not looking up from her book* you find something Jaune?
Jaune: *noms on Ruby's neck* Nah, just figured something out. *leaves a bluescreened Ruby behind*
Jaune: I figured you'd be here *walks up to Yang*
Yang: 'Sup Vomit Boy? You here to join me for a few reps? Maybe upgrade from "Noodle" to "Not quite as Noodley"?
Jaune: *waits for her to finish her set* Nope just came to check on you. Oh, and this *Chomps on shoulder* see ya later Yang *leaves before Yang can reboot*
Nora: *Doomscrolling when she notices Jaune enter* Hey Fearless Leader, anything interesting happen today?
Jaune: *sits on the bed and pulls Nora into his lap for some totally platonic cuddles* Not really, did some research with Ruby, did you know you three are probably descended from Faunus in the last four generations?
Nora: No? How do you figure?
Jaune: *Om Nom Noms and leaves a hickey* just an educated guess.
Book: ...and while physical Faunus traits aren't always inherited, certain instinctual behaviors tend to last through a few generations before being weakened by the less "nature-tuned", but still present human instincts. For lack of better terms, Faunus tend to show habits found more common among the animal kingdom, an example being a tendency to "mark" anyone they wish to become their "mate". While this is often done by giving the other party something of their's to wear, biting is also rather common, and is believed to be where humans get the instinct to give hickeys.
Not sure I like the way the book part came out but basically, in this universe the human tendency to leave hickeys is a remnant of animal instinct, and since faunus are much more in-tune with their instincts, they bite and otherwise mark their significant other's more often. This instinct is more prominent in faunus descendants for only a few generations before the faunus genes are too weak to influence behavior.
