DESPERATE HOUSEWIVES! Which episode was...?!

Question: DESPERATE HOUSEWIVES! Which episode was!.!.!.!?

The one where Katherine sleeps with Susan's nephew!?
I can't remember!
And the Susan thinks it's Dylan in bed with him!.Www@Enter-QA@Com

Answers:

I think it's season 4 episode called Sunday!.!.!. not sure though!Www@Enter-QA@Com

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