Free images results:
 

Duo pictures, stock photos and images

 
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Kayak Stock Images
Author: Rodehi
Pliers #2 Stock Image
Author: Kmitu
Two clips Stock Photos
Author: Misa
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Zebra duo Stock Image
Author: Pradi
Duo Stock Image
Duo
Author: Ptekiel
DUO Stock Images
DUO
Author: Mikemy
DUO Royalty Free Stock Image
DUO
Author: Mikemy
DUO Stock Photos
DUO
Author: Mikemy
DUO Stock Photos
DUO
Author: Mikemy