TPNK with a crowd...do i lead?

[WalkAmongUs]

This happens at one of the looser tables I was playing at. Table VPIP was right at 39%. Every one of the callers in the hand were the players responsible for the looseness. I think the lowest VPIP that called was ~38%. Of course they were all passive as well.

Whats my play on every street?

Party Poker 2/4 Hold'em (9 handed) FTR converter on zerodivide.cx

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img].
UTG calls, UTG+1 calls, <font color="#666666">2 folds</font>, MP3 calls, <font color="#666666">1 fold</font>, Button calls, <font color="#CC3333">Hero raises</font>, BB calls, UTG calls, UTG+1 calls, MP3 calls, Button calls.

Flop: (12 SB) K[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, UTG calls, UTG+1 calls, MP3 calls, Button folds.

Turn: (8.50 BB) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, UTG calls, UTG+1 calls, MP3 calls.

River: (13.50 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, UTG calls, UTG+1 calls, MP3 folds.

Final Pot: 17.50 BB

Obviously getting so many overcallers on the river, I was fairly sure I didn't have the best hand. But I was leading the whole way so I bet the river.