Flopped Top Set, do I raise this river with 3 flush?

[BriPlay]

id prob call too..but maybe raising is better..
what could he have other than flush..
1. 2 pair..Q6s? T6s? kinda unlikely even for a fish.
2. 66 and hit set..a REAL possibility
3. bluffing at flush? unlikely given your read
4.45 and made str8? unlikely i hope.
As you say..he waited til river to raise.....so hard to say
if odds of 66 or other are >50-50..pump it up
all in all i'd prob still call
Brian