Ecstas Online - by the author of Masou Gakuen HxH

TheRedJet

Synopsis : Low in social standing in the school castle Doujun Kakeru (Doumeguri Kakeru), reincarnates into the strongest Demon Lord Hellshaft dominating the Virtual-Reality Game《Exodia Exodus》

Furthermore, he obtained the “Forbidden Power” (Adult Mode).

However, the players who appeared, was none other than the girl he admires Asagiri Ririko who was also his classmate.

Asagiri and the others believe that if they are to defeat the Demon Lord Hellshaft, they can return to their former world, but in fact, everyone’s lives would be in danger if the Demon Lord dies――!?

And in order to save the people he treasures most, Doujun / Hellshaft attacks his classmates with his strongest ability!

( now let´s do some cooking - Start with Overlord then mix it with SAO then add Masou Gakuen HxH and be done by Masamune Kuji(Author of Masou Gakuen HxH) and with they´re powers combined... Ladies and Gentleman Ecstas Online!! - But seriously i didn´t expected nothing from it but after i read this its was interesting to read with the Overlord feel SAO stuff and Masou Gakuen HxH ehmm.. action :D....btw spoiler?...with demon king armor MC is overpowered but if he take it off he´s Lvl.1 powerless/useless prick with now way to level up because he´s Demong Lord/Mob :D)
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Publisher : Kadokawa Sneaker Bunko
Status : Ongoing ( 5 volumes)
Manga : Yes
LNDB

His Servant thought he´s imposter so he showed his power
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He must lewd her(just fondling breasts)to deceive his servant from his secret conversation with summoned girl like him to this world