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He bent forward , but only lifted one of his sister 's thin white hands and held it a moment between his . `` We must both do our best by this foolish little girl who trusts us so frankly with her friendship , must we not , Soeur Angélique ? '' he said gravely . `` I for one am very glad to assume the trust , '' said Mrs. Whittridge . `` And wo n't you ever tire of me ? ever ? ever ? ''