While I can sympathize with the OP's plight, bumping knees in C is still better than an aching back and neck in Y.

My most memorable threesome (seat) experience was on the old recliner configuration pmUA 777. Got bumped up to the last row of biz in the middle seat. Sat next to a very attractive pharma rep and ended up talking/flirting with her for the whole flight. Sadly our brief affair ended after landing.