There are two types of "Succubi/Incubi" here — Ivan

Flirting without even realizing it

SSS-class self-sustaining hunter

I have no idea, I'm just... somehow, for some reason, a lot of people just ended up obsessing over me.

Knows exactly how charming he is, so he starts causing trouble

When the villain possesses the omniscient trait

Oh darling, I just can't find it in my heart to abandon anyone. You will forgive me, right?