Flopped Baby Flush, find a fold or push?

Villain is your avg NL B2B Euro-Loosie (how do you like that for name calling?). No plays out of the ordinary. His stats are 39.69/8.4, 130+ hands. Ignoring my loose pre-flop call, do you ever find a fold post-flop? Or is this one of those times where you go all the way? I think my thought process was something like, "I flopped a flush so there's no way someone else could have one too. I have to protect my 6-high w/ pot size bets."


----------------------------------------------------------------------
Game # 275733951 - Texas Hold'em No Limit EUR 0,50/1,00 - Table "Leon"
Game ended 2006-03-13 01:48:54 GMT+01:00

Players:
Hero (EUR 116,70 in seat 1)
mr_deep (EUR 206,95 in seat 2)
FcBundes (EUR 195,35 in seat 3)
benjiboy (EUR 52,00 in seat 4)
tightweak (EUR 85,50 in seat 5)
NoName321 (EUR 141,60 in seat 6)

Dealer: Hero
Small Blind: mr_deep (0,50)
Big Blind: FcBundes (1,00)

Hero was dealt: 6c - 5c

benjiboy Fold
tightweak Call (1,00)
NoName321 Fold
Hero Call (1,00)
mr_deep Call (0,50)
FcBundes Check

Flop 4c - 2c - Kc

mr_deep Check
FcBundes Check
tightweak Check
Hero Bet (4,00)
mr_deep Fold
FcBundes Call (4,00)
tightweak Call (4,00)

Turn 4c - 2c - Kc - 9s

FcBundes Check
tightweak Check
Hero Bet (16,00)
FcBundes Fold
tightweak Raise (32,00)
Hero All-In (95,70)
tightweak All-In (48,50)
Hero Payback (31,20)

River 4c - 2c - Kc - 9s - Tc
----------------------------------------------------------------------

calling station comes alive with a minraise = bad news for you. Its possible he has K9, but unlikely. What happened?

For the results oriented:

tightweak shows: 3c - Ac (a flush, ace high)
Hero didn't show: 6c - 5c (a flush, king high)

tightweak wins: EUR 174,00 (with a flush, ace high)
Rake: EUR 3,00
----------------------------------------------------------------------

How often do TWO people flop a flush like this? Is it as rare as a set over set scenario? This hand really hurt That's what I get for limping 65s.

Interesting to note is that we each held a card that would give the other a str8 flush

Check-min-raise from a passive player = the nuts. Fold the turn.