M/F

Alright here are all the stories that are about a male and female having sex.

Warren/Alyssa by AP(hey that's me) The first link will bring you to a chapter giving a brief description of the character and what kind of acts are portrayed in the story. The second will bring you straight to the first chapter if all you want to know about the story is that it features a male and a female.

https://chyoa.com/chapter/Warren-Alyssa-By-AP.1469844

https://chyoa.com/chapter/Warren-Part-One.1470324

Jamie/Alyssa by AP. The first link will bring you to a chapter giving a brief description of the character and what kind of acts are portrayed in the story. The second will bring you straight to the first chapter if all you want to know about the story is that it features a male and a female.

https://chyoa.com/chapter/Jamie-Valerie-By-AP.1480505

https://chyoa.com/chapter/Jamie-Part-One.1481049

That's all currently. If you want more books or options to filter through both will have to wait till more stories are added.