GaeTI

A master-slave relationship where one is restricted and seeks permission to break those restrictions. I want a relationship where it's not just about bullying and being bullied. > An exciting experience begins, where one can be a sadist or a masochist depending on the situation and the partner. Thus begins a dizzying battle over who will lead the relationship. "Is this really erotic? I'll show it to you with my body, so pay attention." Original Webtoon

A man has sex lessons with his friend in order to get ready to have sex with his girlfriend.