...how would they clean their soulgems...

So they'll be pregnant with the witches they slay in addition to each other? And then how is Kyubey going to capture the remaining grief seed husk after it's expended? This doujin raises a lot of questions, none of them good ones

out of all the depressing as fuck madoka x homura doujins I've read over the last week this one still sticks with me the most. It must be because of the mixing of intense high and low emotions (e.g., the sudden romantic scene with madoka and then the crushing fall), it makes it feel like a sort of fever dream you'd have as you recall all the good and vile things that ever happened to you all at the same time and in a half-conscious state

also the fanfic mentioned by the author at the end is likewise soul-crushingly depressing, it's well-worth a read