I cannot think of a single way for Erik and Midnighter to kiss. That does not involve some form of mindfuckery, possession, or Mystique looking like Midnighter for some reason. (Okay, that would so, so, so work.)

I'll do my best on John and Sherlock! It'll probably take me a little longer than the others since I've never. Written. Them. MEEP! But good meep!