House hates reruns.
I've seen this before, he thinks, kissing Cuddy and wondering why last year's hallucination felt so much more real than this so-called "reality."
Cuddy seems to be offering absolution by crawling over all over him like some kind of Jenna Jamison wannabe. The resemblance to his recurring fantasy leads House to suspect he might just be jerking off on the bathroom floor.
His body responds, but his mind remains detached, wondering when Amber or Kutner will show up to expose the whole thing as a lie, like the rest of his life.
He won't get fooled again.