If there's anything being in the Potter fandom back in the day taught me, it's that there are plenty of people with incest ships. Hell, I'm not in the Supernatural fandom and it seems like just from secrets here that people ship those brothers together.

There's a slightly squickier connotation with Rodney and Jeannie, since they're brother and sister in real life, but you're surely not alone in incest shipping. I would be unsurprised to discover fic of these two.