It's Christmas and your mom wants to know what you got from Santa. She goes over your presents with you and is really excited for the gifts you got, and you ask your mom what she wants for Christmas. She tells you that all she really wants for Christmas is to be pregnant, but that's it's not going to happen for her because your dad's "swimmers aren't swimming", after an awkward conversation about what that means and the birds and the bees, you offer to let YOUR "swimmers" do the "swimming" instead, aka impregnate your mom. Horrified, your mom rejects this idea, but the more she thinks about it, the more it makes sense to her. Eventually she says yes and allows you to try it, guiding you as you put your dick inside her. She rides your cock and loves every minute of it, amazed at how BIG your dick is and begging to have your hot cum inside her!!