Is this feasible?

Sally & Jack (The Nightmare Before Christmas) It's rather ugly, but I reeeally have no idea what to draw...Ah, the block.
Honestly, I'd love to know how Jack could possibly get down and dirty...Besides having no crotch-line. v_v Ah, well...in my little world, it's typically dormant and achievable. There we go.

Drawn & Coloured in Paint.