Your sister has a huge favor to ask you. As her older brother, you've always said you'd do anything for her. Her and her husband are trying really hard to have a baby but the doctors just informed them that after running some tests, her husband's sperm is so slow that it is unlikely he will ever get her pregnant even though she is perfectly healthy and is at the prime age. At this point she doesn't know what to do so she comes to you and begs you to help get her pregnant and not tell her husband that it is not his. Since she is ovulating, she wants you to have sex with her and cum inside her to get her pregnant and you agree because you're the best big brother ever
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