100NL full: Opponent is good and loose and capable of anything...

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No-Limit Hold'em, $ Hero (8 handed) FTR converter on zerodivide.cx

CO ($92.00)
Button ($88.00)
SB ($138.00)
Hero ($320.00)
UTG ($99)
UTG+1 ($150.00)
MP1 ($110.00)
MP2 ($86.00)

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $0.50.
UTG calls $1, <font color="#666666">6 folds</font>, <font color="#CC3333">Hero raises to $4</font>, UTG calls $4.

Flop: ($10.50) 5[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $8</font>, UTG calls $8.

Turn: ($26.50) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $15</font>, UTG calls $15.

River: ($56.50) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $25</font>, <font color="#CC3333">UTG raises to $50</font>, Hero calls $25.

I can get away from a raise on the turn but not a size raise on the river it seems. I can also slow down on the turn but I put my opponent on an overpair so I wanted value. Villain could've simply had an overpair or a busted draw but then maybe they would've bet more than the minimum.

Any thoughts on this?