2/2 Live hand

Everyone folds for the first time ever. No straddle.
I (450) open A5s to 10 from MP. - I have a very tight pre-flop image, and I've taken down most of the pots I've played
CO (200?) calls - tight-passive player who bought in short and won a big hand
BTN (400?) calls - Standard live player. Likes to call and doesn't like to fold, but not a terrible player
BB (240?) calls - Old guy who isn't afraid to put in money, doesn't like to fold either

Pot - 40
Flop - 575r

BB checks and I bet 28. Very dry flop and I wanted someone to continue with an overpair, 7x or SD.
Everyone calls!

Pot - 152Turn - 6d
Now there's a flush draw on the board and 89 and got there. No way CO has either. BTN or BB might.
BB checks

Hero - ????I thought about it for a while and decided to bet-fold here. Sucks that two players have position on me.
I bet 60.
CO folds, BTN and BB call very quickly.

What do you guys think?
B/f > c/c >> b/c >>>>> c/f



River was an ace. BB donked the last part of his stack, I shoved, which was probably a mistake because I saw BTN was not happy. He folded.
I said ''second nuts'' (even though I didn't have second nuts), and BB mucked before I'd finished my sentence.