MP2 has had really really really hot cards and has got pretty good value out of him. He hasn't had to be tricky because he has been getting magic frops (tm).

No real read on the CO.

What are your thoughts on cold-calling the flop raise?

I know the turn raise looks really bad - is a straight call here the right play, especially given that CO has gone from raising the flop to flat calling the turn?

PokerStars No-Limit Hold'em, $0.50 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

SB ($43.75)
BB ($66.90)
UTG ($9.65)
UTG+1 ($17.15)
MP1 ($42.10)
MP2 ($154)
MP3 ($36.40)
CO ($37.10)
Hero ($48.25)

Preflop: Hero is Button with , . CO posts a blind of $0.75.
UTG calls $0.50, UTG+1 calls $0.50, 1 fold, MP2 raises to $1.5, 1 fold, CO (poster) calls $1, Hero calls $1.50, 2 folds, UTG calls $1, UTG+1 calls $1.

Flop: ($8.50) , , (5 players)
UTG checks, UTG+1 checks, MP2 bets $2, CO raises to $4, Hero calls $4, UTG folds, UTG+1 folds, MP2 calls $2.

Turn: ($20.50) (3 players)
MP2 bets $3.5, CO calls $3.50, Hero raises to $12, MP2 calls $8.50, CO calls $8.50.

River: ($56.50) (3 players)
MP2 bets $31, CO calls $19.35 (All-In), Hero folds.

Final Pot: $106.85

Results in white below:
MP2 has 6h 6d (full house, sixes full of nines).
CO has Qc Qd (two pair, queens and nines).
Outcome: MP2 wins $106.85.