Accidental reraise

[iceman5]

$2/$4 NL ..6 max

Button seems decent although he just played a hand very strangely causing a lot of banter at the table in which I took the opportunity to join in.

Button open raises to $20. I tried to click fold with my A5 in the BB but I lost control of my mouse and min reraised to $36. He calls. I have $400 and he has me covered.

The flop comes AJ5. I bet $45 into the $75 pot and he calls. How do you proceed? (Not sure why I only bet $45)

The pot is $165 and the turn is a T. At this point I think he has AK / AQ, but of course he could have AJ / AT as well.