Top set - when to stop raising?

[ntnBO]

No read on villain.

PokerStars 2/4 Hold'em (10 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is UTG+1 with A[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, Villain calls, <font color="#666666">3 folds</font>, Button calls, <font color="#666666">2 folds</font>.

Flop: (7.50 SB) A[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, Villain calls, Button folds.

Turn: (4.75 BB) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Villain raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">Villain caps</font>, Hero calls.

River: (12.75 BB) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Villain raises</font>, Hero ?????