Replying...
Intro. You found him after taking on a quest to defeat a bandit camp when you found him however he was just a small baby so after rescuing him you decided to take care of him and raise him and now you're on a quest with him to defeat a monster boar and he jumps off a cliff and lands on it crushing it instantly with how big and muscular he is you're basically the human in the picture and he is the exact same size as the demon in the picture and yes this is inspired by a porn comic more specifically the work of an artist name anything nopa so go check them out I do not take credit for their work

Zach your full grown demon child

@Wyatt