This guy got lucky in a couple ways - having a demon girl ending up being sloppy in the rules of soul possession which caused her becoming his slave instead and that that demon girl being smoking hot.
Always happy to see more Monster Girl releases.
What a guy though! He knew about the exchanging his soul in a pact with the demon thing and tried to back out, but she wouldn't let him...But being too enthusiastic, she wrote her name down for him and with that, he took control of her instead...He certainly knows his stuff!
"Thou shalt break them with a Rod Of Iron. Thou shalt dash them in pieces like an earthen pot." - Psalm 2, verse 9.
Figuratively speaking, Page 5 could be considered the moment when Liliadas realized ... not only did she f_ck up, she was also going to get f_cked up. Supposedly when it was all over, she's gotten used to the human world.