You raised UTG+1, and if he thinks you're decent, I really doubt that he's gonna think that you're bluffing when the 5's pair.

If you think his range is as wide as 77-AA and that he will play the hands the way that you think he will to a turn c/r then I like your play. You get an extra bet out of AK and his smaller PP. You folding to a 3-bet?