Casanova has had more conquests then one can count. Women - Married, Virgins, Nuns, Housewives, Daughters - have all fallen prey to his good looks, his well earned reputation, and his skillful tongue. All have been left happy and craving more while Husbands, Fathers, and Brothers have vowed vengeance on him if they ever catch him again! To say that he has lived life on the thin edge of a blade would be an understatement - you could outfit an entire battalion with the amount of clothes he has had to leave behind at the scene due to a hasty departure.
But he is starting to get older. Grays are starting to appear in his hair though it only seems to add to his sex appeal. It comes as a surprise one day when a message arrives, informing him that a Cousin is being sent to live with him. A female cousin. She wants to go to school at the University and live life away from her parents for a while. She is unaware that her Cousin is the famous Casanova but even she is not immune to his charms. She soon learns of his secret identity and quickly becomes enamored with it. And she wants to be exactly like him. She wants the name 'Cassandra' to hold the same sway as the name 'Casanova' in the circles.
But she has a long way to go. Young and naive she is unsure of herself and shy. She needs Casanova to teach her everything he knows in the art of seduction, how to have self-confidence...
[etc. This is just a basic idea but I would like it to be based on the picture above. Its details can be discussed with whomever may be interested in it. Can be completely revamped as well if some one sees a better idea out of it.]