Am I flush over flushed here?

7 handed I am MP with [9h] ($27.90) and open limp.
CO (Pretty new to the table, but seems to be playing a lot of hands. Haven't seen him get out of line post-flop yet.) raises to $1 ($17.70 behind) and I call.
[4h][6c] Pot $2.35
Check, check
Pot $2.35
I've picked up a ton of outs there so I bet $2, CO calls.
Pot $6.35
I figured that river would scare him so I went for another $2 bet again thinking that may be the only thing he called, but now he raises to $7.25

I'm not folding, but can I put him on anything other than a better flush? Am I pushing or just calling?

CO looks more like he either slowplayed something to death or is making an attempt to make up for playing the flop/turn like a puss with AK/AQ. His raise can mean anything, but I think you got action and there's more he'll be stubborn with and call a push that you beat than possible flushes that match his lines through the hand.

On another note, I'd lead for a little more ($3-$3.50). It'll still induce a bad raise and it'll be a little bigger to commit him a little more or he'll just shove with as bad as AQ.

Just call. If you reraise you get a call from hands that you beat about 5% of the time max.

Nah. My thing when I drunk late at night are the cheap SNGs, sometimes the $60 deep stack games, but lately it's been the $10 and $25 PLH/PLO mixed games. Sober, I bet the hell out of that flop with 666, let alone drunk.