It was a year or two ago I first found this.
There is multiple parts to the story.
All parts are about Amy Pond and Clara Oswald having lesbian sex, with Amy being experienced and teaching and dominating Clara, who is new to lesbian sex. There is extremely light bondage, with handcuffs being as extreme as it gets.
The bits I remember are in the first part the doctor drops Clara off at Amy’s house and as Rory is away they Amy coerces Clara into sex there is spanking and fingering then Amy get handcuffs and restrains Clara
In another part Amy throws Clara into a river.
That’s all I remember if anyone can find it it would be great
Source: reddit.com/r/eroticliterature/comments/6b06wt/doctor_who_companion_erotic_lit