I tried it, it is not for me in its current form. Sill, I like the succubus theme so I'd like to offer some constructive criticism:
1. TEXT.
It's difficult to read, especially the dialogues. White on black text is fine, but the font is too "soft" looking. Use something more crisp, with sharp edges. Also the red fields on black background with white text hurt my eyes. Not sure how, but I think it's the white-on-red. Removing the red fields might help. The dialog is separated into bubbles with the caption denoting who is speaking. Also the red bubbles again. It would be much better if you would color-code the text to characters, e.g. protagonist talks in white, Lilith in neon purple, and so on for each character. Something like that:
Mika: Yes, master?
Mia: Sister, can you stop referring to this idiot like that?
Alternatively just color-code the names and write the dialogue like this:
Mika: Yes, master?
Mia: Sister, can you stop referring to this idiot like that?
The red bubbles are not good.
2. Sex with succubi has no consequences. It would be interesting if the protagonist had his own "life energy" bar that is also used for spells and the succubi really wanted to have sex with him, so they would try to tempt him. Then, if he accepts, energy bar goes down because they drain it every time he comes. Then they could encourage him to do it again and again and you would have to choose to stop. If you don't stop and the bar goes to zero, you die. The energy is restored when sleeping.
3. Sex scenes are just videos. The temptation, foreplay and scenes should be described with words, with pictures and videos added to enhance the description.
4. A pentagram is a 5-pointed star in a circle. If he's drawing the star of David, like in the prologue, just use "magic symbol" or "summoning circle" o something like that.