Nl100: small OP on the flop vs minlimpraiser?

[BetYourLife]

Party Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 6 Players - (LegoPoker Hand History Converter)

Hero (SB): $109.93
BB: $18.50
UTG: $130.13
MP: $92.98
CO: $64.33
BTN: $104.06

Preflop: Hero is dealt J[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img] (6 Players)
2 folds, CO calls $1.00, <font color="red">BTN raises to $4.00</font>, Hero calls $3.50, BB folds, <font color="red">CO raises to $7.00</font>, BTN calls $3.00, Hero calls $3.00

Flop: ($22) 9[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/spade.gif[/img] (3 Players)
<font color="red">Hero bets $15.00</font>, CO calls $15.00, BTN folds

Turn: ($52) 4[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $25.00</font>, <font color="red">CO raises all-in to $42.33</font>, Hero calls $17.33

River: ($136.66) 9[img]/images/graemlins/club.gif[/img] (2 Players - 1 All-In)

Pot Size: $136.66 ($3 Rake)

CO is a fish calls a lot and hates folding, not really aggressive.
Well now I really realize how bad I played there. preflop I think 3betting him here. But what do I do if Co pushes min4bets then?
Flop I wanted to see where I am at. Therefore I donked it and if Co calls and BTN raises I would lay it down. c/r would be to expensive. Or do you just c/f on the flop because of not hitting a set?