Let me help you. MIN-HYUK can't help but feel attracted to his girlfriend's mature sister. One day, he ends up seeing something and couldn't resist the temptation.
[Original Webtoon](https://toptoon.com/comic/ep_list/not_you)
**Official Translations:**
[English (Expired)](https://toptoonplus.com/content/My-Girlfriend's-Sister/101155), [English](https://daycomics.com/content/101155), [T.Chinese](https://www.toptoon.net/comic/epList/80887), [Japanese](https://piccoma.com/web/product/128916)
"I'll help you masturbate." Minhyuk is attracted to his girlfriend's sister from the moment he saw her, who has the opposite charm to his cute girlfriend. Then, by chance, he sees his girlfriend's older sister masturbating. He just had to pretend he didn't see it...
