Dexter told Delilah that he is good at getting what he wants. The trick is to just look at the person with wide open, innocent eyes. No pleading is necessary. Just look expectant. In the rare case where it might not be working, try tilting your head to one side and look like you adore the person. Dexter guarantees it will work every time.
Delilah said that she has not had as much success with this technique, but then she has more exotic, slanted eyes. They are not so innocent looking! However, she recommends tilting your head to the side, touching it to the floor and looking up. This works for her!