OKAY, here's what everyone has been waiting for...
So a massive outbreak occurs in Nevada and it's bad enough that anyone who is either willing or able, is called in. Leon arrives with Chris and Jill, and they're tasked with cleaning out a infected part of the Vegas strip. They need to stop the spread and hold back the hoard so they can give civilians enough time to escape.
Its not easy though, whatever has infected everyone seems to be an amped up version of the T-virus, considering that almost every zombie they encounter is either a Crimson head or a full blown Licker.
There's no time for chatter as they three throw themselves against the hoard and after awhile Leon finds himself falling into that familiar, deadly dance he learned in Yharnam and creates a shower of gore. Infected blood splatters all over him and he instinctively darts his tongue across his lips to taste it, and freezes.
It tastes just like Eldritch blood.
It's like his whole body has been doused in liquid fire, and he before he can even comprehend what he's doing, he's got his teeth buried into the neck of Licker. His axe and gun clatter uselessly onto the ground as he starts tearing into the infected with his bare hands, trying to get as much blood as he can from his prey.
He's not really aware that he's changing, his body rapidly transforming into a beast with the more blood he consumes. He doesn't know how much time passes either, but when it's over he's surrounded by an ocean of red and piles of half eaten corpses.
Someone is yelling at him, but they don't smell like prey, so he ignores them, deciding to groom himself before heading out to look for more blood. He's unable to do so though, flinching when he feels several darts pierce his side, and snarls in offense before he passes out.
Hours later he wakes up in a bare room reeking of chemicals and with no visible escape. He paces the room in furious anger, banging his body against the wall a couple of times to try and get out, but as time passes his mind slowly begins to focus.
He becomes more aware, and the horrifying realization that he's become a beast just like Gascoigne has him wailing in shame. He tucks himself into the corner in a pitiful attempt to hide, covering his muzzle and eyes with his giant clawed hands.
Then, like some fucked up fairy tale, his body begins to begins to change back. It's painful and slow, but soon enough he's back to being human again and he can't help but nearly sob in relief.
Chris and Jill come in moments later, matching looks of relief and horror on their faces, and Leon guesses he's probably sporting a similar look himself.
((Unfortunately for Leon, Infected blood tastes just as good as Eldritch blood, so if he gets blood drunk and consumes enough of it, he will turn into a beast. However because of the traces of Elpis in his blood, he can change back into a human if he detoxes enough.))
((Leon won't attack regular humans when he's a beast and only regards those with infected blood as prey, that also means he CANNOT be around Sherry when he's like this. It actually TERRIFIES Leon that he could hurt her, so he kinda starts to avoid her. All he can think of is Gascoigne's wife, her mutilated body lying inches from his feet, but now with Sherry's lifeless face.))
((The beast form on the bottom left with the tail and back tentacles is basically Leon's phase two if he was a boss. If he gets injured enough he'll takes this from and has the ability to produce electricity from his tentacles and mouth.))