Friends plugin. Let a user be friends with other users (multi-user blog)

I have a multi-user blog. I would like my users to be able to “be friends” with other users. On a specific author page there should be a button that say “Friend”. When clicked upon, this user should be added as a friend.

There should be a widget that shows all the friends (profile or names) for a specific user

A specific user should be able to have several friends.

A specific user should not have to verify another user as a friend.

Is there such a plugin?