Double Insertion [futa, dubcon, twins]
 

https://www.smashwords.com/books/view/991884

Grace and Honor are identical twins who are excited about their weekend getaway with their boyfriends. While packing for the trip, the two discover a long simmering taboo lust for each other rise to the surface as they discuss their relationship issues. A visit to a sex shop and a chance encounter affords them a mysterious item that allows them to carry out their innermost fantasies and use their altered bodies in ways they never could imagine before to exact revenge on their unsuspecting beaus.

This is a TABOO erotic story featuring sexual intercourse between sisters, futa transformation, dubious consent, FF futaxmale and futaxfemale intercourse.

https://i.imgur.com/KfLYslxl.jpg