@help-
There's a good Omegaverse switch series... two, actually. I'm trying to go through my "finished reading" list to find them, buuut... it's taking a looong time to go through thirty-someodd pages, sorry! But yes, search the Omegaverse BL, you'll find a couple of them with switch pairs.
EDIT: I found it. "Like a Tidal Wave - from Pheromone Shower"
Ask me about my 70+ lists, including Omegaverse, Esperverse, Dynamicverse, and Cuteness Overload!