You've taken your breeding kink a little too far and now your only "step-daughter" is pregnant. While this excites you immensely, you absolutely must cover your tracks, so you ask your step-daughter to let a boy her own age cum inside her so that the two of you can frame him as the step-father. Although she's a very good girl and will do anything you say, she hates the idea of being with anyone but her step-daddy, and finds the experience deeply traumatizing. You should probably comfort her.