You can train yourself to dream about the last thing you were thinking but it takes a lot of practice and if your subconcious wants to deal with something it will show up somehow - in your case Mikey and Ryan fisting in the desert-though I honestly can't see where this is a bad thing :P.
(lucid dreaming is maybe a 'thing' of mine :)

Also omg WHY do I have this sudden urge to lick the back of Mikey's neck? tyvm ♥