Asking to teach with 〜てもいい
Grammar Explanation: Permission to do with 〜てもいい

When Syaro is invited to study at the library with the others, she considers Rize may praise her for helping the others.
- シャロ:
- 「そ そんなに言うなら教
( えてあげてもいいかなー」- “I-if you insist that much, maybe I could teach you if that's okay.”