Using Deform to make a leaf

I have a part which is not a four sided surface which I wantto deform in order to provide the look of a organic leaf.

I can untrimmed the surface in order to have it return to a foursided surface which allows me to deform the item. But the problemis that I need to have the surface deformed along an angle opposeto the horizontal or vertical path that the tool restricts me to.

I have drawn black lines to show the direction I want to follow inorder to create a path.


Any suggestions, I can send the part file if that helps....

SolidworksSurfacing