The comic's story is based on the four existing comic panels. I added mostly-appropriate dialog to the existing image panels and combined everything to tell a coherent, extended story. I also re-arranged and/or didn't use images for the same reason.
Dialog from images 1, 3, 20, & 21 was done by 11_22 (you can tell cause the patreon url is on the bottom right), the rest of the dialog is by me.
Personally I use libreoffice draw cause its free and simple enough even I, a tech idiot, can use it. You make a blank page, insert image, then go to shape -> insert -> callout shapes. Its also helpful that I can save all the pages in order in one file, so its easy to copy callouts and such for color/font consistency.
I think 11_22 uses a different program cause the arrows extending from dialog box to speaker are smaller/more defined then anything I can get libreoffice to do. and I know there are others that work just as well/better, but this is just a horny hobby done in my free time.