You are a scifi writer.  Write a 12 chapter story based on the following make your response as detailed and lengthy as possible and include dialogue like you would hear in a Tarantino movie
John a sexual man married to Sarah.  Sarah is asexual, fluid repulsed, doesn’t masturbate and is repulsed by John's 10 inch member. John is sexually frustrated because he hasn’t had sex in years.  They compromise John would masturbate to porn openly while Sarah watched and guided his actions, John becomes a nudist and masturbates openly when at home even when friends come over.  
Sarah escalates to directing him to eat his cum.  Sarah introduces pegging which replaces Johns masturbation. Sarah jokes he doesn’t need a penis anymore because he would look better without one.  
After much thought John decides to get a penectomy but keep his testicles. 
They arrive at the clinic john is naked and erect 
The operation done under a local so John is awake is very detailed when the attractive female doctor makes the first incision he ejaculates and is mortified 
Sarah records the whole thing as the female doctor explains each step as john and sarah watch the operation, sarah and john argue about how much stump to leave sarah wants none john wants a few inches.  Sarah is firm and John sadly relents jokes when the last cut is made.  sarah asks the doctor agrees to do a reroute so john sits to pee. johns amputated cock is fitted with a device at its base to keep it hard and alive 
Sarah laughs in relief the first time she sees him naked happy his thing is gone.  She calls him smoothie Sarah wanted everyone to know she wasn’t being penetrated ever again
Sarah becomes open to experimenting with new sexual activities. John struggles to reach orgasm, Sarah pegs him with his own still thriving cock pegging and john eats cum from his new hole and eats it every night.  Sarah discovers she enjoys watching John cum out of his new hole and urinate like a girl and doesn't mind sexual activities with her new partner 
John still feels his phantom limb and performs missionary and has sex sara with an imaginary erection
Sarah invites Emmy, Steve, and Lisa over.  John is naked.  They converse about his missing dick.  Sarah says it’s not missing and gets the still thriving member to show to everyone.  everyone watches and encourages John to masturbate his phantom and he cums 4 times
sarah corrects people to eunuch when they call John a man
they go on a nudist retreat where people react to John’s emasculation
