Nowa is a bear who lives in the forest. He found a puppy named Airi a few years ago, and is now raising him. When Nowa goes into hibernation for the winter, Airi is still but a pup. But when Nowa wakes up from his hibernation, he finds Airi has grown into an adult dog. 
 
(Source: Anime News Network) 
 
Note: The complete edition with explicit scenes was distributed web via Comic Festa Anime Zone. The censored version was broadcasted on Tokyo MX and BS11.

Caressing the Nipples of My Hibernating Bear