yes, definitely best friends XD

So does this mean that technically they're pregnant with each other?

Best Friends? Seriously?

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

^No scratch that, they'd literally die if they separated more than 100m distance :0

They seem to be very good friends

...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