He was never my D - we didn't play that way, but as the creative lead in our playtime, he often came up with fun homework assignments for me to do.
Sometimes it would be having to write something for him. Sometimes it was "shopping" together online. Other times it would be a solo play that I would then have to describe the next time we talked. He was very detail oriented and creating an image was key, so it was necessary to really let myself FEEL the fantasy in order to give him a true recall on the emotions his task generated.
I had a real love/hate relationship with these assignments, but now that they are gone, I realize the significance they had in building a bond. I miss it. I wish I could find it again.