I can't find an episode where they both are, but you may be recalling S07|E13Stew-Roids when Bonnie asks Lois to put lotion on her back.
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S07|E01 Love, Blactually
Breaking Out Is Hard To Do
That would be the episode, "Snafu".
Episode 3 in season 5, "Out of Sight, Out of Mind". It was the shows 99th episode overall.
In the special episode, Julia shows up.