Are y'all sure that a Sim can milk this Sims 3 version? Or is that something from the Sims 2?
Yes you can. My plant finally had a meal.
This is what happened. The plant teased him with the cake, sniffed him thoroughly then gulped him down. Grim showed up and did his thing. Once the Sim was collected and a gravestone was there, Grim went to the plant and he "appeared" to be scolding the plant but then he was petting it and talking to it. The Sim who was gulped had two romantic interests, one in the household and one not. They both happened to be there at the time of the gulping. Both got the heart broken thought. The Sim in the household milked the plant and when she drank it acted like she had just downed a triple cappuccino or something. She got the great meal moodlet that had a seven day length. She also aged back a day. I'm going to guess that if she had been older it might have gone back farther. She did keep her broken heart and mourning moodlet.
This plant could be great for the gold digger LTW or any time you need a Sim to "disappear".