Climax Training App - Younger Sibling's Breast Milk Edition

“Tongue, bro. You know. me..... Go on a date with your girlfriend today.....” On a weekend morning, Jang Choi-geon, who was stiffened by a bomb remark thrown by his stepbrother, turns on the ‘climax teaching assistant app to interfere with his date. The more I use it, the more guilt I feel at my younger brother's peak appearance and the more excited I become.

Original Novel:
Volumes: RIDI, MrBlue, Naver Series
Chapters: Bomtoon, Naver Series

Original Webtoon:
RIDI, Bomtoon