Help finding a manga

[MasiosareEE]

Hello!
I need help finding this manga, pls. It is mature.
It's about a girl who was reincarnated in a fantasy world and became a magician.
He has to prevent a war between the hero and the demon/dragon king (I don't remember what it was).
When he enters the demon/dragon king's castle, he mistakenly gives them an aphrodisiac and everything happens.
Sorry if something is not understood, i don't speak English and the autocorrect did not help much. 😔
thanks.

 

[jecroisenlasuperioritedubel]

In the Castle : the Dragon's Erotic Education

?

 

[MasiosareEE]

In the Castle : the Dragon's Erotic Education

?

No, it's not that one😔 the protagonist is a woman
But that one looks entertaining, thanks!