When Mr. Joo and Mr. Young tried to have sex, things went awry due to Mr. Young being too big down there. Eventually, Mr. Joo gave him a second chance due to how besotted Mr. Young seemed to him. The meticulously prepared Master's Lesson is finally starting!

(Source: Peanutoon, translated)

Note: Part of Peanutoon's Gosuwi BL Danpyeonseon (고수위 BL 단편선) Collection.