[Vidi Vici Veni (Cessa)] Black Rose

A demon-blooded schoolgirl who sells her body on the side gets caught red-handed when a bespectacled blackmailer produces photo evidence of her debauchery. Pressed into servicing him between her enormous breasts and with her eager mouth, she insists it's only to keep him quiet, yet the more worshipfully he moans, the closer she slides toward genuinely falling for him. By the finale the power flips entirely, leaving the trembling boy to discover he never tamed her hunger at all, he simply awakened it.