Kim Kardashian is her sister's breast milk.

Kim kept pestering Kourtney Kardashian on this week's episode of Kourtney & Kim Take Miami to keep pumping out her new-found miracle cure for psoriasis, and Kourtney kept wondering why her sister was so interested in her breasts all of a sudden.

In this bonus clip from the episode, Kim attempts to promote the benefits of a particular breakfast food for milk production, which makes Kourtney even more suspicious. Is Kim taking it too far? Watch the clip and decide for yourself!

Tune in Sunday, February 10 at 9/8c for an all-new episode of Kourtney & Kim Take Miami, only on E!

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