This artwork depicts the following scene from Hot Dam:

Only the sun told how long she and the other ponies had stayed in the water, and were Celestia having a bad day not even that. In any case, hunger eventually bothered the plump pony, and she retreated to the shallow edges to rifle through that saddlebag with her face; the upper half of her body was hanging out, with her middle struggling to gain friction on the lip and make anything else inconvenient. She pulled out a carrot to munch on while she lazily lay on her side and get dirt stuck to her fur.