bottom set, slow play flop, fold river ?

[cbloom]

I'm set-mining at $100 NL. Villain is MP2 - on the loose side preflop (VPIP 40), and thinks two pair is a good all-in hand postflop, but can fold TPTK. I know a lot of people are going to complain about me not raising the flop, but if you do please say exactly why.

Party Poker Pot-Limit Hold'em, $ BB (8 handed)

saw flop|<font color="#C00000">saw showdown</font>

BB ($192.20)
UTG ($62.63)
UTG+1 ($106.80)
MP1 ($77.65)
<font color="#C00000">MP2 ($179.60)</font>
CO ($91.95)
<font color="#C00000">Hero ($111.85)</font>
SB ($35.60)

Preflop: Hero is Button with 2[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $0.50.
UTG calls $1, <font color="#666666">2 folds</font>, MP2 calls $1, CO calls $1, Hero calls $1, SB (poster) completes, BB checks.

Flop: ($6) 8[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG bets $2</font>, <font color="#CC3333">MP2 raises to $7</font>, CO folds, Hero calls $7, SB folds, BB folds, UTG folds.

(I just call the flop because there are no draws, normally I would raise solid here)

Turn: ($22) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP2 bets $7</font>, <font color="#CC3333">Hero raises to $24</font>, MP2 calls $17.

River: ($70) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>

MP2 checks. Hero ?