Three from Four - Instigation
Tilly Vanilla

John and Geoff have been best friends since their school days. They each marry, and their wives become equally close friends.
The two wives both carry a similar dark secret. Then, one weekend while away on a girls-only weekend, they admit to each other what they desire the most. The scene has been set, but the act has not yet begun.
One night one of them is presented with the opportunity to make the first move and initiate a series of adult adventures.