In fact, it is Sima Pi x Wang Muzhi. There are three works in this series and one textual research. Well, like that chocolate candy, three wishes are fulfilled at once.
"And, because he and his queen are extremely affectionate, he naturally wants to share good things with his beloved, so he took the queen, Wang, to eat together." (Stick Reading)
Purpose: Maybe it's a tribute to freedom and hard work... Hmm...