Warning: Voraphiles may find this sexy. If you're not a voraphile and this somehow /offends/ you despite how non-sexually explicit or graphic it is... you're a silly person and should probably just hit the back button now.
This is another edit, as I found myself without motivation to make something from scratch. The original(s) were made by this user on Pixiv: www.pixiv.net/member.php?id=25...
This is a great base, and it was already in the form of an admittedly primitive animation! Fully animating this proved too hard to resist, so here I am!
Unfortunately I lost inspiration early into making a short story to go with this, so you'll have to use your imagination! Perhaps this is revenge for that time Dawn ate May? Or perhaps May was digested after that picture and this is entirely separate?