does anyone know?

[sergiosilvagni]

hi,can anyone help me with the title or author,the story goes,daughter and g/f come out to mothers,mothers announce they were lovers years before,the mothers teach ex lovers daughter sex,then mothers have sex with own daughter with strapons........ i know its a vague description,its all i can recall of story,i cant seem to find anywhere,if this story rings a bell,i would appreciate title names, thanks