(Not) Limited by Blood [PODFIC]
This is the story otherwise known as "The Role of the Sharingan in Sex and Endogamous Bonding and Incidentally Kakashi's Massive Control Issues". I'm really not sure I can summarize it better than that. Written for the Porn Battle prompt: Kakashi/Sasuke, teacher. Porn with Characterization and Worldbuilding.
Warning: clan endogamy may result in incest-y vibes for some.
Azlover7888, Starlight_13, angelitos, Ruth_McKean, JaneTheCrazedFanGirl, PrussiaSheiala, Vice, 91AkiNishi91, Human_Thing, Pipi2323, Lucca_Uzumaki, passeridae, star_reader, poisonivymargay, Chronoofdarkness, Raevynd, Keitorin, boybuiltfortrouble, CircusOfOne, and rippleeffect as well as 10 guests left kudos on this work!