(a) 'Past consideration is never good consideration:

Discuss.

(b) Charles and Devi own a dental practice. Devi is in a relationship with Charles' sister, Erin. Charles tells Devi that he will pay for their honeymoon if Devi and Erin get married. Unknown to Charles, Devi and Erin are already engaged when this promise is made. After Erin and Devi marry, Charles is annoyed to discover that they did not tell him about their engagement and refuses to pay for their honeymoon.

Discuss whether Devi can enforce Charles' promise to pay for the honeymoon.