Ok folks, since there's now a bunch of us and mass PMing is not to going to be very handy, I'm setting up a special forum to coordinate our work! In the meantime, could you please give some thoughts on:
1) Theme -> I would suggest "Uniforms", because the first submission and my own story incidentally involve uniforms, and uniforms are prime material for sex and/or gore, wouldn't you say?
2) Anthology name -> I like "Tapastic by Night", but we can definitely have a vote on that and other names, so come up with some and we'll choose in our separate forum.
3) Cover illustration -> @ifluke1 will take care of it. If we all agree on the theme, I guess s/he could come up with something really cool, given his/her tailor shop
But again, other suggestions are welcome
4) Format -> I would go with alternating one illustration and one story. At the end of each illo/story, it would be nice to have a separate page featuring the author/s. I also think that stories should not exceed 20 pages. Page size should be checked for readability on Tapastic by each artist (you could check Tapastic guidelines on best practices and maybe try a page or two before submitting)
5) Content -> I would like to have original content that hasn't been published anywhere before. You will be free to republish it, of course, after it's been completely posted on Tapastic
6) Updates -> What about one page, twice a week? Given I'll be pretty much busting my butt off, I hope you are ok with me hosting the anthology under my Tapastic account
7) Promotion -> The purpose of this anthology is to promote NSFW, mature comics on Tapastic: to do so, we need to help each other out and spread the word. Let's discuss our strategy on how to do that.
We can start discussing here, and then move over to the forum as soon as it's ready (please, be patient, I have a demanding full-time job) 
Any other thoughts, of course, are more than welcome!