Featuring the fic "Personal Quality Assurance" by nickelkeep

AO3 link: https://archiveofourown.org/works/19766686

podfic link: https://archiveofourown.org/works/39371763

Rating: Explicit

Tags for this fic include:

Dean Winchester, Castiel (Supernatural), Gabriel (Supernatural), Sam Winchester, Michael (Supernatural)

Alternate Universe, Alternate Universe - Modern Setting, Mechanic Dean Winchester, Adult Toy Maker Castiel, Castiel and Gabriel (Supernatural) are Siblings, Background Relationships, Minor Eileen Leahy/Sam Winchester, Minor Gabriel/Kali (Supernatural), Masturbation, Sex Toys, Dildos, Cas makes Dildos, Anal, Anal Play, Anal Fingering, Anal Sex, Rimming, Blow Jobs, Strangers to Lovers, E-mail, Implied Selfcest, Smut, Fluff and Smut, Quality Assurance, tentacle dildos, Custom Dildo, slots of dildos, Points of View, POV Alternating