You and your twin step-sister are back home for the holidays after your first semester at college. It's the first time the two of you have been separated for more than a couple weeks, and you've missed her more than you can comprehend. You're thrilled to see your twin step-sister, and you have to admit that she looks even more beautiful than ever, though it is a little awkward napping in the same room. But your parents are remodeling the house, so neither of you had a choice.
You wake up to your step-sister poking and prodding your arm. She wants to have a little heart-to-heart, and she was never one to wait for a convenient time. Your step-sister confesses that she's not happy at school; she's doing well in her classes and making friends, but what she really wants, deep down, is to get pregnant. Right now.
Your heart stops when you hear what she whispers next: she wants you to be the step-father. She knows how you've always felt about her, those secret feelings of desire you thought you'd managed to keep secret, and she feels the same. "More than anything", your step-sister murmurs, "I want your seed. I need your cum inside of me, shooting up my cervix and impregnating my fertile womb. I'm ovulating right now, so it's the perfect time. Please, please give me your cock, your semen, your sperm, oh please! I want it more than I could possibly articulate, and I know you'd do anything for me."