The Starting Line Is Useless, I Choose to Devour the Demons

[Western Fantasy + Sinister Protagonist + Funny and Relaxing + Family Revival] ["Demons" are everywhere and can never be completely eliminated. [So, what if we swallow it, absorb it, and then tame it until it completely dissipates? [In this way, one day, true magic will bloom on this land! Due to a bizarre chance, the mad magician Eric and the original sin demon Mephisto were forced to share a body. As a useless person who cannot cast magic, Eric relied on the power of his family's treasure to reverse Mephisto's black magic and completely swallowed its power, establishing the master-slave relationship between him and the Demon King in one fell swoop! The two fight openly and secretly. Eric dreams of reviving the demonic family, the Meiwenjie family; Mephisto attempts to occupy Eric's body, take the opportunity to resurrect, and rule the demon world again. This is a "devil parasitism" adventure with different motives! ——"Let's be nice, shall we?" ——"You humble human being... Are you trying to make me surrender?!!"