Sanscest Stuff

Vote time

So, I'm thinking about making something on Crossmare (Nightmare Sans x Cross Sans) but I need some help deciding if it should be a oneshot on my "Fandom Oneshots" or a full story, either way I already have a plot.

So please my beloved readers, comment which you'd like, I know this a ErrorInk book, but I really wanna do one or another.
Also no, the crossmare book or oneshot won't interfere with the updating of other stuff, at least not make it slower then it already is.

So back to the main topic:
Crossmare book with ??? chapters?
Or
Crossmare oneshot on "Fandom Oneshots" book with 5000+ words?

Thanks.