Is this proper use of a blocking bet?

The only reason I played this hand OOP against a raise was the great pf odds. I really never felt comfortable betting this hand on any street as I was afraid of AK, however I felt like I was in control of the pot size. On the river I decided to bet the most I would want to commit and fold even to a minraise. I thought checking may induce a bigger bet from villian and make a tougher decision for me. Was my line ok?
Party Poker No-Limit Hold'em, $ Hero (9 handed) FTR converter on zerodivide.cx

UTG ($57.50)
UTG+1 ($145.20)
MP1 ($115.79)
MP2 ($48)
MP3 ($118.50)
CO ($26.20)
Button ($163.10)
SB ($116.82)
Hero ($100)

Preflop: Hero is BB with Q[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img]. SB posts a blind of $0.50.
<font color="#666666">1 fold</font>, <font color="#CC3333">UTG+1 raises to $4</font>, <font color="#666666">4 folds</font>, Button calls $4, SB (poster) calls $3.50, Hero calls $3.

Flop: ($16) K[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets $8</font>, UTG+1 calls $8, Button folds, SB folds.

Turn: ($32) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $15</font>, UTG+1 calls $15.

River: ($62) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $25</font>, UTG+1 calls $25.

Final Pot: $112

Played exactly as I would have done - but that doesn't mean it's right!

looks ok to me... maybe a little more on the turn, but river is fine

I think you are probably beat by AK here.

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I think you are probably beat by AK here.

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