The "full story" and irony of the scene is that, while the character's reaction and the setting imply sexual infidelity, the "affair" is actually Jessica playing a vigorous game of with Marvin Acme. For a "Toon," this innocent children's game is treated as the equivalent of a serious romantic betrayal, leading to the central conflict where Roger Rabbit is framed for Acme's subsequent murder. Cultural Context
In the movie, private investigator Eddie Valiant is hired to provide evidence that , the "busty" and glamorous wife of toon star Roger Rabbit, is having an affair. Valiant spies on her through a window and takes photographs of what appears to be a scandalous encounter.
The query regarding "Pattycake" and a "teen" story appears to refer to the popular 1988 film , specifically the scene involving the character Jessica Rabbit and the game "Pattycake." The "Pattycake" Scene Summary