Notes:

EDIT: The image is actually an edit from linkfrompennysylvania on tumblr. The original source itself is from a furry doujin called Wolf/Cow, which has a fan translation by tumblr user shoeboxxx. Huge thanks to Glacier for telling me the info about the edit and the source. The doujin artist of Wolf/Cow is gamma-g, who also made another doujin called "Build (or Built) Tiger", and was also the artist for the popular furry visual novel Morenatsu (potential NSFW stuff ahead as the link takes you to the KYM article about it). Just a small fun fact.