So, to make a long story short, I didn't want to do that last drawing, but I did it anyway. I already knew that forcing myself to work was the fastest way to thoroughly burn out my creative battery. But I had already agreed to it.
Lesson learned: It's called a 'request' because it's a request. My slip wasn't even because I flaked out and let someone force me to feel obligated. It was because I apparently didn't quite understand the concept of a request.
So basically what I'm saying is that I'm not sure when the next drawing will be. I wish I had a monitor to check my battery percentage, but I don't. All I know is that it'll be back relatively soon, and it'll probably be in the form of some shitty meme drawing. You have been warned.