[Harv72b]

The preflop raise is sort of getting into that grey "advanced play" arena...I like it, and it's certainly correct in this situation, but you have to be pretty comfortable with your postflop skills to play a hand like KJs from out of position after a preflop raise. So yes, it's good that you thought about raising, and at some point you should be raising here, but just completing is not terrible by any means.

I like leading the flop. Some people will no doubt say you should have check/raised--the problem is that with nobody raising before the flop, you can't be sure that anyone will bet it. And since no draw short of QJ has the correct odds to call even 1 bet, there's not much point in facing the field with 2 (you'll only end up folding hands you'd like to keep in, given the pot size & your hand).

Do not 3-bet the turn. That would be absolute spewage in a HU pot. How many outs you have is questionable--if MP1 is holding QJ then all you have is your flush outs. If he's got AT or A6, you've got 11 outs. Either way, you do not hold an equity advantage over any hand that MP1 is likely to raise with, so a 3-bet is just lining his pockets over the long run.

You have to lead the river. He's a pretty passive player, and that's a very scary river card depending on his holding (don't forget that it puts a 4-straight to broadway on the board, as well as the flush possibility). A passive opponent can only be counted on to bet this river if he's got the J, but he'll call with quite a few more holdings.