limped pot flops straight

[allabout]

Villain was completely unknown. Was about 1/2 stack when I got to the table and doubled up within a couple hands with a set vs table donk's weak top pair. Is the flop 3bet a good size? His flat makes me think maybe flush draw, weak overpair, I doubt its a set. Is the plan on the turn bet fold? Bet shove? Check call?

Full Tilt No-Limit Hold'em, $1.00 BB (8 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

SB ($176.25)
Hero (BB) ($101.50)
UTG ($82.70)
UTG+1 ($118.05)
MP1 ($108.70)
MP2 ($56)
CO ($100)
Button ($118.70)

Preflop: Hero is BB with 2, 4
UTG calls $1, 4 folds, Button calls $1, SB calls $0.50, Hero checks

Flop: ($4) 5, 6, 3 (4 players)
SB checks, Hero bets $2.50, UTG calls $2.50, Button raises to $7, 1 fold, Hero raises to $19.50, 1 fold, Button calls $12.50

Turn: ($45.50) K (2 players)
Hero?

[badgers]

$4 on flop. 3bet bigger. As played I may even c/f depending on sizing, I think sets/2pairs are checking behind a lot and then we can get value on riv.

[ATOTHEC101]

$4 on flop. 3bet bigger. As played I may even c/f depending on sizing, I think sets/2pairs are checking behind a lot and then we can get value on riv.

[pokerfan]

I LIKE B/F against these half stack buyin guys.

[euphoricism]

Why pot flop? That's not something I'd considered. I guess draws will call it, but it folds out a lot that might call a smaller as well?

[allabout]

I meant to bet about $3 on the flop but was messing around with Full Tilt shortcuts and was timing down and just hit bet. The flop 3bet might have been a little small looking back at it.
If we bet fold turn, thinking about $29 or so?

[daven]

The flop 3bet might have been a little small looking back at it.

yep, he's calling $12 into $45 so a fd would call expecting to get some more $$ out of you if the flush hits. Sets are also in range and aren't folding to a bigger bet.