- Sin's Kisses
- Sin's Magic [Rapture Island 3]
- Sin's Thief [Vampires of Vadin 3]
- Sinclair Academy - 01
- Sinders & Ash (Deutsch)
- Sindriel [Sequel to Love's Demon Ways]
- Sinepoi
- Sinfonia da alma
- Sinful Desires
- Sinful Gods
- Sinful Ice: A Fantasy Reverse Harem Romance
- Sinful Solace
- Sinfully Wicked: Magic and Mayhem Universe
- Sing A Mournful Melody: A Gothic short
- Sing Me Your Love Song
- Singer from the Sea
- Singer of Visions
- Singing Electricity
- Singing in the Wolf's Shower
- Singing with the Devil
- Single Dad Matchmate
- Single Dad Shifter
- Single Vampire - Mated Alpha
- Single Weretiger DILF
- Single White Vampire
- Single Witch's Survival Guide
- Single Witch's Survival Guide (15th Anniversary Edition)
- Sinister Weddings
- Sinking Hearts
- Sinless
- Sinner's Delight
- Sinning Again
- Sinning Again
- Sinning Forever
- Sinnliche Märchen: Die Komplette Kollektion
- Sinnliche Märchen: Reihe in 3 Bänden: Band 1
- Sinnlicher Bann
- Sins of a Wolf
- Sins of Eden
- Sins of Mercy
- Sins of Mine: A Paranormal Prison Romance
- Sins of Omission
- Sins of Oz
- Sins of the Damned
- Sins of the Flesh
- Sins of the Immortal: A Novella
- Sins of the Night
- Sins of the Sister I: Genesis, A Romance Novel
- Sins of the Son: A Tale of Bluebeard
- Sinth Savior: A Sci-Fi Alien Romance
- SIO
- Siofra's Change: Book 3 The Broadus Supernatural Society Series
- Siofra's Fight: Book 4, The Broadus Supernatural Society Series
- Siofra's Nightmare: Book 2 The Broadus Supernatual Society Series
- Siofra's Song: Book 1 The Broadus Supernatural Society Series
- Sips and Spells and Wedding Bells
- Sir Edmund Orme
- Sir Genkaku Host Club
- Sir Genkaku Host Club (Book 2)
- Sir Harry: A Love Story
- Sir Isumbras at the Ford
- Sir Kay and the Flamingo of Death
- Sir Spanksalot
- Sir Tom
- Sir Tristan’s Estate
- Sire
- Siren Call [Gods Behaving Badly 1]
- Siren et Joran
- Siren Misfit
- Siren of Secrets Box Set
- Siren Song
- Siren Warrior Chronicles: Books 7, 8, and 9
- Siren's Call
- Siren's Code: The Siren Legacy Book Three
- Siren's Curse
- Siren's Love Song
- Siren's Nocturne
- Siren's Seduction
- Siren's Serenade
- Sirens 1
- Sirens 2
- Sirens 3
- Sirens 4
- Sirens 5
- Sirtimi
- SIS Interludes Vol 1
- Sister & Serpent
- Sister Anne
- Sister Golden Hair Surprise and the Cruiser
- Sister Mary Does A Faery
- Sister No More An Erotic Vampire Romance
- Sister of a Sinner
- Sister Planet
- Sister Sugar