Have you always wondered, man, I wish my bookmarks matched the books genre... even if it's just a little... 

Well, Smut lovers, I gotchu. And GUESS WHAT? 

THE FIN SLIDES ALONG THE SHAFT TO HELP MARK YOUR LINE! 

Hey Google, search "boner shark"

From Wikipeenia: Boner Sharks form the family Phallusibone, named for the length and girth of their rock hard bodies. Most Boner Sharks can be recognized by their bulbous tail structure, but Dr. Raven Blackhart would like to remind all researchers to not judge a Boner Shark for appearance; Boner Sharks have been discovered in all shapes and sizes around the world. Like the Hammerhead shark, Boner Sharks will congregate and swim in large schools during the day, becoming solitary hunters at night, but we're not here to kink shame a Boner Shark who needs a school to perform.     

Choose your favourite skin colour , as well as your desired shaft length! 

The pictured example is Light Peach, and comes with a respectable 8" (22cm) long  - suitable for up to A5 sized books! 

If you are looking for other colours, we can probably do it to - just drop me a message in Discord or hunt me down in some chat on Twitch!