you know what, screw it. I'll make my own story... and let's call it - "Darkseid's Fury trainer!"
it's basically this - you just play as Darkseid and your goal is to have as much as possible Female Furies to have the strongest army in the galaxy!
the path to that is you have to capture heroines (all type, from regulars to meta, to etc.) and break them into submission. and that means different methods; some need physical-break, some need mindbreak, some maybe just persuasion. it's up to you to figure which ever it works. and not only that, you have to see which heroine is "compatible" with other so there's gonna be a lot of "pairing" (and maybe with not just other heroines, wink, wink)
oh, maybe even better idea - you are a low rank prison guard grunt in Darkseid's army and you move up the rank by your actions of capturing and braking heroines...and your goal is to eventually overthrown Darkseid with Furies on your side! (ok, that is maybe over the top, I can't help it, I'm a writer...)
I wish you good luck since the previous fangame based on SU is dead and I don't think we'll ever see any more versions,
hopefully you have more luck Regarding what has been said, you already know that SR7 gives permission to use its assets as long as they are non-profit fangames etc
in case you are interested about the plot personally I like it more that he is an anonymous soldier than darkseid himself to become you the next lord of apokolips in fact it comes to mind to add to the idea some kind of rpg combat system with your "slave fury" on your side while you dominate other heroines and finally defeat darkseid (and other villains that could be used as mid-bosses like joker or grood or the savage Vandal himself (and once defeated have access to another group of future furies to subdue)