Oh. Oh. Duh. I've heard about the Star Trek story before, more than once actually, why the heck did I forget -_-;;;

I miss knowing the seme and the uke in slash fandoms

I kind of miss that too, and actually, I dare say the majority of fics one would consider IC in the end are the ones with the same seme/uke sequence as the reader desires. Because most fanfic writers associate a character's 'position' on bed with his personality elsewhere... and it's not really a good thing. I do have read great H/D fics in which Draco is or 'takes turns to be' seme and are perfectly IC in my eyes, and I truly admire those authors. For breaking the cursed link between character personality and seme/uke position I mean :P