Mikuru kept getting distracted by the sex going on in front of her, though she was able to snap out of it and focus - at least somewhat, her body still very horny from the curse - on the shopkeeper.  Once he finished with Sarah's rings and the girl was showing them off, Mikuru smiled and nodded.  "They do look good on you, Sarah.  Now, pay the nice man for his work and we'll go back to the apartment," she said, trying to remind the girl to at least behave somewhat.