Secret Lessons for My Sister

"I heard you're the master at sex." His friends call him Dr. Sex, but in reality, JIN-YUNG is still a virgin. However, he lies to his sister, BOM, and acts like he has experience. However... He didn't expect BOM to sneak into his room asking him to teach her about sex every night!!! [Original Novel](https://novelpia.com/novel/195534) [Original Webtoon](https://toptoon.com/comic/ep_list/XX_lesson_with_my_sister/?p_id=novelpia57) **Official Translations:** English ([Toptoon](https://global.toptoon.com/content/103494), [DAYcomics](https://daycomics.com/content/103494)), [Japanese](https://toptoon.jp/content/%E5%A6%B9%E3%81%A8%E3%81%99%E3%82%8B-%E3%83%A9%E3%83%96%E2%99%A5%E3%83%AC%E3%82%AF%E3%83%81%E3%83%A3%E3%83%BC/103660), [T.Chinese](https://www.toptoon.net/comic/epList/81122)