This mug is from the best selling Edward Monkton range and features The Lady and the Chocolate.  It reads:

Chocolate:  You want me lady don't you?

You want me!  You want me!

Lady:  No chocolate, I do not want you, for after the initial pleasure there is sickness and there is guilt

Chocolate: That, Lady is the reason for my existence.  Are you to deny me the reason for my existence?

Lady:  No, chocolate.  I would not do that

Chocolate:  Thank you.

(A munching sound is heard, followed by a sigh of pleasure)

The mug is a standard sized coffee mug and is made of porcelain.