Of course, there is no obligation and we do it (or at least I do) for fun, because I enjoy drawing stupid stuff like when I added a drunk Gramul on someone else's sketch or my early jokes about sailor moon keepers xD

If it takes so long for me to draw it's mainly because when I'm back home I just jump on my bed, turn on FF and lazy around till I have nothing to do, when that happens I might take my note book and doodle someone's mug, sometimes i draw a lot in a row sometimes I don't draw for days and even weeks when I just don't feel like it.
Sometimes I skip people because I think that someone else can do a better job than me on this one or because I'm not the only person taking request or just because I just don't feel like drawing xD

So yeah, it will take the time it will take but as far as I'm concerned, politeness boosts my morale, even more if you add some details about what you want like Xxaral with her Ifrit.
But know that when I see people who just post pics without saying anything or without an ounce of "respect" toward our artist for the job they did and the job they'll do for you, even if they didn't meant it that way at all, it's like my motivation took a meteor rain in its face :/

Anyway, enough ranting, look forward for the next session

And holy crap kyan you've been skipped for more than 20 pages and never said anything?! Post your pic back immediately, I'll try to make some time for you tomorrow :3