persephone_flees just totally wrote that story for Yuletide, and it is kind of THE GREATEST FANDOM THING TO HAPPEN TO ME THIS YEAR, AND I MEAN THE PAST 12 MONTHS, NOT JUST TODAY.
Talia! Talia evil! Lyta! Kosh! Ivanova! Bester! Plot-related telepath-kind-of-sex! The story is Susan/Talia, and even if that's not your thing, you should totally read it for the awesome Lyta and a totally great S5 AU.
"How to Ask?"
You B5-type people out there: Read it!