Sadistic Disciplinary Instructor and the Villainess ~post reincarnation lessons on bed manners~

The protagonist, an ordinary old female office worker, ends up being reincarnated into the world of an R18 Otome game... as the villainess!

While she may be one of the prince's fiancée candidates, when the prince falls in love with the game's heroine, she is a side character destined to be executed... or at least... that's how the story was supposed to go...

For some reason, her betrothal to the prince was successful!?

The protagonist is perplexed by the turn of events which is different from the game's story that she knows.
On top of that, the prince's aide has come along and...
What's that? He's here to teach her (in the) bed manners, and foreplay technique because the prince dislikes virgins!?

Being a virgin in both her previous and post reincarnation lives...
In order to avoid being executed, the protagonist ends up accepting lessons from the sadistic instructor...

The tale of a woman who undergoes sweet intense pleasure discipline at the hands of a mean sadist.