Your auntie advises her and her wife want to get pregnant but IVF/artificial is too expensive. She asks if you can donate some of your sperm. Wank in a condom and she can use a turkey baster or something. You suggest it's better to do it the old fashioned way as its more of a guarentee it goes in the right place.. Shes very reluctant as not only are you her nephew, she likes girls not boys and hasn't been near a penis in years. She ends up agreeing but finds it really strange. She ends up encouraging you to cum by getting you to imagine her and her wife together. Huge creampie.
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