Well Juro roughly means "tenth son", and Mushi refers to any small crawling creature that isn't a fish or a bird

So his name is basically "Grub Son"

1. I think I want to abridge their recapture in some way, because there isn't really a way to create an impression their defeat is anything other than guaranteed, unlike Oboro/Momohime being able to overpower Meioki if he didn't have Shizuka's ghost helping him. Is this a good idea?

2. I do want to work in some reaction to Kikuka and Ouka seeing their mother alive again, but I think I need to work with the context that the last time they saw her alive, she was under the thrall of Meioki, and that is still the case now (I've also still got my twist idea in mind, but I want a way to build to it without making it too obvious what Shizuka wants to do. I already did a little foreshadowing in the first chapter with the bit where none of the lewd memories Shizuka fondly recalled involved Meioki)

3. Lastly, I need some ideas for sex stuff I could do that isn't just what happened to the twins in the Shoku OVA. Currently all I've got in mind is one of the twins being raped by juvenille oni, presumably children of Meioki.

It might be cliche', but could take a note from the series itself where Kikuka and Ouka are separated. So the demons use that divided power and increased fear between the two (probably more worried about their sister than themselves) to capture them both, faster. Something like that, splitting them up initially...

I'm pretty fuzzy on the Goku twins backstory DLC. They'd probably be pretty sad seeing their mother or image of her again, but then maybe fired up even more for revenge (especially Kikuka. She seems like a fighter similar to Mikoto to me).

Hard to not suggest and think of combo bodily penetrations and sharing with the twins. All the way through going in and out of various holes between the two, lol, I like that stuff. The series gets pretty wacky with the FUSION ideas... I'm not too big on those though. But maybe some kind of creature connecting their sandwiched belly buttons together could be fun.

There is of course, always the super diabolical Rinko x Kyoko "head" scene in the Shin DLC... but size difference helps that illusion. It's an idea I want to see more of though lol. Mikoto and loli Takeru, or their mother involved, the twins... Rinko x Sui...

I will say though from my own personal sexual fanfic writing, it can be different and fun enough just writing a sexual scene with two girls or more involved. So you maybe don't have to think of anything too creative or original, it might just be fun writing about both the twins being violated and impregnated by tentacles, while they can converse more than a solo captive, etc.

That's actually a very interesting way of combining those two seemingly incompatible plot lines!

Thanks! Although I’ll say I was partially inspired by Taimanim Yukikaze and it’s similar “mother who became a baddie” plot point.