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1. Principle of Pleasure by CuckooTrooke

   Fandoms: One Direction (Band)  

   • Explicit
   • No Archive Warnings Apply
   • M/M
   • Complete Work

   25 Dec 2025

   Tags

   • No Archive Warnings Apply
   • Harry Styles/Louis Tomlinson
   • Harry Styles/Original Male Character(s)
   • Louis Tomlinson/Other(s)
   • latter is only mentioned
   • Louis Tomlinson
   • Harry Styles
   • Zayn Malik
   • Niall Horan
   • Mentions of Liam Payne
   • Original Female Character(s)
   • they're all amazing - Character
   • Sex Therapist Louis Tomlinson
   • Cat Owner Louis Tomlinson
   • Bisexual Louis Tomlinson
   • Mental Health Issues
   • Past Trauma
   • Implied/Referenced Child Abuse
   • religious trauma
   • Post-Traumatic Stress Disorder - PTSD
   • Borderline Personality Disorder
   • neither are the main focus of the story
   • they're just part of who Louis is
   • but obviously they still affect him to a degree
   • Anxiety Disorder
   • I swear there's a lot of joy in this fic too just give me a second
   • Implied/Referenced Self-Harm
   • and relatively graphic and open talk about it
   • Cheating
   • not between louis and harry
   • except kinda but like no
   • fuck around and find out
   • Past Infidelity
   • Overthinking
   • Surgeon Harry Styles
   • it's less hot than it sounds okay
   • he's kinda struggling
   • References to Depression
   • Burnout - Freeform
   • Exes to Lovers
   • Childhood Friends
   • Sexual Tension
   • Miscommunication
   • Mutual Pining
   • Drunken Flirting
   • Talking through sex
   • Laughter During Sex
   • Communication
   • they're learning
   • Daddy Kink
   • Anal Sex
   • Oral Sex
   • Angst and Hurt/Comfort
   • Internal Conflict
   • Slow Burn
   • Cats
   • minor rants about bureaucracy and capitalism
   • Sex Talk
   • Awkward Sexual Situations
   • mostly referenced
   • Angst with a Happy Ending
   • Happy Ending
   • Awkward Dongles
   • go figure
   • Louis Tomlinson vapes
   • Wordcount: Over 100.000
   • Wordcount: Over 200.000
   • Competence Kink
   • Honestly though they're very patient and gentle with each other
   • It's full of cutesy and lovely even though the tags might suggest else
   • Equestrian Harry Styles

   Summary

   Louis Tomlinson is a highly successful sex therapist, building his enviable career in the heart of Chicago. But behind closed doors, he's haunted by the demons of his past.

   Dr. Harry Styles is an exceptionally gifted yet troubled cardiothoracic surgeon who has made all the wrong choices, and is now trying to find his own path after spending a lifetime pleasing other people.

   A story of growth, forgiveness and compassion.
   And cats.

   Language:

   English

   Words:

   239,465

   Chapters:

   7/7

   Comments:

   128

   Kudos:

   444

   Bookmarks:

   176

   Hits:

   13,788