I turned into a beautiful girl

Under the threat of losing his life, the boy signed a contract with a demon that is considered taboo by humans.
Is it the loss of life, or the loss of sex? The boy resolutely chose the latter.
——It's strange!
"What's going on in this state?!"
"Isn't this the posture you aspire to be? Or do you have any opinions on the concubine?"
Outlining a wanton smile on her immature face, the beauty devil said so.
"Damn it!"