How? Hmm, how indeed. How is he usually brainraeped? Take that, have him vaguely expect it to be similar to that so he can seek a Happy Place, then subvert it and turn Happy Place into brainraep 2.0?
Well, he is caught under the sakura trees in his dreams and carved up and having a sadistic urge to hurt himself with rape because Muraki finds it amusing. SO that's fun! Muraki-mun has some interesting ideas about him thinking he's waking up when he's really not. And see Muraki in mirrors and stuff first, to properly tense him up.
You....brainraep 2.0 Wooooow. That will so be the title of the log, when I log it with her.