Demon awoken.

"Please don't leave me. Please, I need you."
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Along time ago a month after a war broke out between the demons and the rest of the world a demon woke up in a cave of a young healer. It had been a month since he was knocked out and the war had ended. Since then Meliodas had woken up in an unknown girl's cave. So, there's a lot of things to wonder such as where are all the demons? How does this girl know about demon anatomy? Or can basically heal everyone despite not being a goddess?
I do not own the seven deadly sins or Greek mythology. Just my Oc and my ideas of what goddesses will be like in the show.