https://literotica.com/s/succubus-sister-or-taboo-corruption

Emi closed her eyes and focused on the sheet of paper.

"I need your desires, Emi. Those sexy little secrets you hide deep away. Your taboo desire for your twin brother. Your lustful desire to be fucked and used and dominated. Draw it out, everything you've pushed down for all these years. Draw it out and let it fall into the paper in front of you. Focus it into a sigil of your own."

Emi felt fire in her cheeks as she blushed hard, but didn't resist the words from the voice. She felt those desires buried deep within, and tried to let them fall from her chest onto the paper before her.

"You're doing it, Emi. Keep going. All that holds you back, all those little pangs of conscience that keep you from taking what's yours. Why deny yourself pleasure? Why shouldn't you take what you want? Let those desires out. Let them shine bright."

With her eyes closed, she could not see the sigil appearing on the paper in front of her. The sigil and flame of the candle shone eerily luminescent in her dark room.

"Why should I deny myself pleasure?" Emi pondered aloud. "Why should I hold back?"