AK w/ raggedy flop & I'm min-raised

[martindcx1e]

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PokerStars No-Limit Hold'em, $0.10 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP2 ($22.05)
CO ($27.75)
Button ($11.90)
SB ($3.90)
BB ($8.80)
UTG ($8)
Hero ($14.55)
MP1 ($11.60)

Preflop: Hero is UTG+1 with K, A.
1 fold, Hero raises to $0.4, 2 folds, CO calls $0.40, 3 folds.

Flop: ($0.95) 2, 7, 2 (2 players)
Hero bets $0.7, CO raises to $1.4, Hero raises to $4

[Fnord]

How far do you think he goes with 88?