Synopsis: Climax Training App - Younger Sibling's Breast Milk Edition

"H-Hyung. You know... I... I'm going on a date with my girlfriend today..."Frozen stiff by the bombshell dropped by his stepbrother on a Saturday morning, Jang Choigeon turns on a 'Climax Training App' to sabotage the date.The more he uses it, the more his guilt vanishes at the sight of his brother reaching climax, and he becomes increasingly aroused+