Small pair against an odd turn bet

[topspin]

UTG+1 is extremely loose postflop. He's happy to call one or more bets on the flop with marginal draws or pairs. Thus far he also appears pretty passive. He's spewed off most of his stack and begins this hand with 5BB. MP3 has only recently joined and I have no reads.

Paradise Poker 1/2 Hold'em (10 handed) FTR converter on zerodivide.cx

Preflop: Hero is MP2 with 6[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls, UTG+1 calls, <font color="#666666">2 folds</font>, Hero calls, MP3 calls, <font color="#666666">2 folds</font>, SB completes, BB checks.

Flop: (6 SB) J[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, UTG checks, UTG+1 checks, <font color="#CC3333">Hero bets</font>, MP3 calls, SB folds, BB folds, UTG folds, UTG+1 calls.

Turn: (4.50 BB) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+1 bets (3BB stack left after his bet)</font>, Hero sees one player still to act behind him and ...