[Closed] A2s flushdraw huge pot

Hand converted with online PokerStrategy.com hand converter:

Play hand

$1/$2 Fixed-Limit Hold'em (6 handed)

Preflop: Hero is SB with 2:s, A:s.
MP2 posts deadblind, MP2 posts deadblind, MP2 checks, MP3 calls, CO folds, BU calls, Hero calls, BB checks.

Flop: (5.5 SB) 7:s, 6:d, 5:s (5 players)
Hero checks, BB bets, MP2 raises, MP3 3-Bets, BU calls, Hero caps, BB calls, MP2 calls, MP3 calls, BU calls.

Turn: (12.75 BB) 6:h (5 players)
Hero checks, BB checks, MP2 bets, MP3 calls, BU raises(All-In), Hero calls, BB calls, MP2 calls, MP3 calls.

River: (19.625 BB) T:d (4 players)
Hero checks, BB checks, MP2 bets, MP3 calls, Hero folds, BB calls.

Final Pot: 22.625 BB.

How should I play this? Coldcall flop? Bet turn? Wtf.