Nii-chan Adult

Nii-chan is about a story between a young boy in grade school who often goes to this 'Nii-chan''s place to play video games after school. However, the 'Nii-chan' has ulterior motives and asks for sexual favours... Will the boy give in to 'Nii-chan''s persuasion or will he put a stop to it before it all goes wrong?