Story ideas || Please help me choose

Hello fellow, umh, people?

I've never written a story, or at least not a good one, but I wanted to try. I've read A LOT more, so I hope all the books I've read will help me maybe make some good books as well.

I don't know which story to write tho, I have 2 different ship-stories in mind.

YoonSeok - Library Boy
&
VMin - I'm not a slut

Idk which one to write first, so I'm here to ask y'all? Please tell me which one I should write as my first

Note:
Both stories, YoonSeok & VMin, will prob contain angst, fluff, and as much smut as I can (bc that's who I am. An angsty, fluffy smutty person). Tho I'm not even sure if I can lmao. But ill try, I promise