Title: Knock on Wood
Eunchae is as superstitious as they come. He wholeheartedly believes in horoscopes and fortune tellers, and when he's offered a backscratcher made of the remnants of a tree that was struck by lightning multiple times for a premium price, he jumps at the chance. Because of the tree, the backscratcher has the power to knock away bad luck, and Eunchae plans to take full advantage. Apparently, the power of the backscratcher is made stronger when performed by someone with the word “tiger” in their name, which means his old childhood friend Jiho fits the bill.
Though hesitant, Jiho comes to Eunchae's house and proceeds to hit him with the backscratcher. After a few days of this routine, Jiho becomes curious. He asks Eunchae to hit him with the backscratcher. Eunchae hits Jiho once, and surprisingly, Jiho moans. Thinking it was just a one-off, Eunchae hits him again, and Jiho moans. But Jiho isn't the only one reacting. As Eunchae hits Jiho and he listens to his moans, Eunchae finds himself aroused. What new kinks is this situation creating for these college friends?