In Photoshop you can set the brush dynamics to Fade, which causes the brush to get smaller and smaller as you paint. But sometimes I'd like the brush to start out small and get larger as I paint. Is there any way to do this?
If you can draw the painting area with a pen, set your preferred brush and other dynamics. Right click on the drawn path, then select Stroke path. In stroke option, select pen pressure.
or you could reverse the draw with fade option as you specified.
I'm not a designer, sorry i just know this much. May this help you or someone else.