He reads the description

"Allure demon: this fiend takes the form of a gorgeous woman, usually blonde, but can be told apart from humans because of its lips, as black as its blood, its violet eyes that glow in the dark, its feline-like canine teeth, and the retractile claws it sometimes uses to defend itself. The demon preys on mortals, seducing them and sexually dominating them, gaining much vital energy from the act.
However, said energy is not enough to completely sustain the demon, which still need to regualarly eat small quantities of food, and to drink. The demon is carnivorous, hence the developed canines.
Such a demon wouldn't be a valuable target for a summoning ritual, if it wasn't for its most interesting characteristic: if a mortal man manages to overpower the demon and sexually dominate it instead, he is gifted with added virility; however, should the demon get the upper hand on a man who has knowingly challenged it, it will drain his masculinity in ****."

Erik was immediately interested. He believed he was expert enough to control the Allure demon, and reap the benefits, and he needed such benefits: he never was a manly man, and that always annoyed him; although he wasn't androgynous at all, he was just a bit too short for a man, his facial features a bit too delicate, his physique a bit too small. Summoning this demon could finally make him a more attractive man, just like he wished he could have been.

Erik spent the next months gathering the ingedients for the ritual and preparing his plan to **** the demon to accept his commands and submit to him. He resolved to use a "Slaver's geas", a spell that forces to obey all the caster's verbal commands, and prohibits the victim to inflict phsycal harm on the caster, or on themselves.

Now, his plan ready, Erik prepared for the ritual. He had drawn a pentagram on the ground and placed candles aroud it, something that most summonings required. He placed a bowl full of the rare ingredients he procured in the centre of the drawing and set them ablaze with a candle.

Steeling his resolve, as smoke filled the chamber, Eric opened the book on the page he needed and began reading the arcane words that completed the ritual. After a full minute of chanting, he poured a vial of his own blood in the bowl. The flames coming from it immediately intensified tenfold.

However, nothing else happened for about a minute. Erik close the book, disappointed, believing the ritual had failed, and open the windows to let the smoke out. He was mistaken though, because just then with a sudden crack a figure materialized, covered by the smoke.

Slowly, the smoke dissipated, allowing Erik to see clearly the creature: it, or rather she, was a woman wearning a simple robe, with perfect alabaster skin and long wavy blonde hair; however, she had her back to him, and he couldn't say more.

The demon turned her head toward him, allowing him to see her glowing violet eyes. She smiled, exposing her feline canines, and started walking toward him.