It also acts as a reflexive pronoun to indicate the said action is being received by the doer. "He told us the story" - Nos dijo el cuento (Here, "nos" is the IO) Give it to us! - "¡Dánoslo! "We showered and left for the party" - Nos duchamos y salimos para la fiesta. "Nuestro/a/os/as" is a possessive pronoun meaning "our". More @Wikipedia
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