@Rex she already got the price from him for fulfilling his wish, she claimed his innocence as the price for fulfilling his wish. so technically his soul is hers and even if she returned to the demon realm he would have to go with her because he belongs to her...technically under the terms of their contract.
2D tomboy waifus with abs are awesome, but 3D girls who want to give you the vacu-suc glug glug 9000 are even better.
