This takes place before this: https://www.furaffinity.net/view/44809425/
After he saved Christmas, Rudolph was given a hero's welcome upon returning home. However, he was too tired to celebrate. Instead, he just wanted to rest. After his parents and Clarice helped him home, they, except Clarice, left him to rest.
Clarice stayed to do any favors Rudolph might want done. And he did. "Clarice," he said in a soft voice, "could you do me a favor?" "Anything for you, my hero," she said. Rudolph got up and turned around and sat down. "Could you massage my back?" he said. Clarice agreed. However, she couldn't take her eyes off his butt. Rudolph noticed this and said, "Clarice, if you want to massage my butt instead, I don't mind." "I'd certainly be glad to," said Clarice in a sensual voice. So after he stood up and presented his butt to Clarice, she gave him a well deserved massage.

Rudolph © Rankin/Bass and Robert May