Permission to do with 〜てもいい
Grammar: Permission » 〜てもいい
Permission to do an action can be requested or given by taking the て form of the verb, and appending もいい.
Following a misunderstanding, Cocoa and her friends ended up at the tea house where Syaro works. When Syaro is invited to study at the library with the others, she considers Rize may praise her for helping the others.Further Reading
Examples
Asking to have tea with 〜てもいい

Asking to teach with 〜てもいい

Supplemental Examples