Noganaerineun Cake-cheoreom!

On a strange, rainy night with a full moon, adult novelist Areum discovers a physical secret her childhood friend Beom-Ho has been hiding. Curious, she touches Beom-Ho's body, and a brilliant idea for her next novel strikes Areum! Ever since, whenever she's stuck on a story, she feels her writing improves when she meets Beom-Ho. To overcome her slump, she proposes a strange contract with him... but this contract also presents a golden opportunity for Beom-Ho, who has a crush on Areum!

"I'll seduce you, no matter what, sis!"

(Source: Peanutoon, translated)

Note: Includes 20 extra chapters.