Angelina
Yes,but if it is unusual for her,she may feel a bit unsure about how and when doing it.
But,yes,she should be happy about it.
Sara2001 Yes, he accepts that he can not change it and that she can not change it, too. He hates her restriction and feels very bad for her but so far he doesn't want to quit the relationship.
He seems very understanding and compassionate,and probably an important support for her;
Angelina
I agree.Talks are important for them.
He seems to accept it well.
Lukas
I think you can tell her.Even if she didn't know the word,she probably have some guesses about the fact.And that the belt prevented her to touch her "there",too,to prevent it.As long as she didn't experience an orgasm before,knowing what masturbation means would probably not change much her frustration,I think.And it would be helpful for her if she doesn't want to tell her friend about her chastity belt,but want to make her think she have done it.
Sara2001
It is uncommon in France,I think.If I remember well,we had only one lesson,for 1 or 2 hours about it,and it was mainly about the risks and how to protect us from them.
Renita
I don't think it would be helpful.Her friend may be in trouble if her parents don't like it and don't know their daughter does it.And if she guess they discovered it due tu @Lukas' family,their friendship would stop.