From the episode All His Wishes Cum True.
One of the old men in the hospital Luna works at gets his two biggest wishes true this day. One; he gets to become young again, and Two; he gets to tap some sweet piece of ass!
When Luna sees her patients transformance she is eager to have sex with him. She opens up his fly and out comes a huge penis! She sucks it good and gets her snatch licked in return. After that he penetrates her asshole hard and we also get to see some ass to mouth action at the end.
