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send bob
Erm, I have one. But I can't really say you might like it or not. It's called, "Maou-Sama, Retry." The MC finds a kid and the kid called the MC, Maou Sama.
http://www.mangago.me/read-manga/tendou_ke_monogatari/
He is not a demon but he is a bully
With the hero being like a demon(scary) in front of the heroine. Or like a bully. Thanks in advance.