100nl 77 turned straight vs pot stealer

aggressive villain is " to be 2891" one of the few winning players at FT 100nl playing even a little loose - he runs 19-14, 3-bets 5% and is aggressive on half of flops seen. He is good at picking up medium sized pots vs weakness, probably assisted by having played a fair amount of winning HU 500nl as well. His bluff raises/bets are usually close to pot. He's been running over me a bit across five tables, his read on me is that i like folding.

UTG is 19-5 over 200hands, all around fairly passive, calls too much. His range is pretty wide here...

pre-flop and why not setmine...
flop and i'm happy not to play aggressively on a gutshot this time.
Turn - I know I look weak leading half pot here. Without reads I bet close to pot. Bingo, I get action. Now what? cib or slam?

Full Tilt No-Limit Hold'em, $1.00 BB (9 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

UTG ($214.40)
UTG+1 ($100)
MP1 ($104.30)
MP2 ($299.10)
MP3 ($101)
CO ($100)
Button ($49.10)
SB ($98.10)
Hero (BB) ($101.90)

Preflop: Hero is BB with 7, 7
UTG calls $1, 2 folds, MP2 raises to $4.50, 4 folds, Hero calls $3.50, UTG calls $3.50

Flop: ($14) 5, 9, 6 (3 players)
Hero checks, UTG checks, MP2 checks

Turn: ($14) 8 (3 players)
Hero bets $7, UTG calls $7, MP2 raises to $38,

I'm probably shoving just because of board.

I really want to smooth call against this player but there are too many cards that will make us throw up on the river so I say tank for a while and shove. Looks like a set to me.

if he's doing it for value, then you should shove. if you think he's trying to move you off your hand, you should call, check/call (even the scariest rivers!).

I'm just not sure which is the best choice, really depends on how I think villain thinks. I'd probably call and call any river. Because I live dangerously.

I'd check/fold a 7h river though!

call and shove any river could be cool as on hearts/board pairing you might fold out a chop

edit: as long as UTG folds the turn

shove

hopefully he won't fold his set so shove