Hello Belgas,
Flop: Since it's freeplay pot I wouldn't take any aggression at all, just Check behind, also if we even hit our flush it will be only T high. As played Bet/Fold likely better, since it's a freeplay and I wouldn't get fancy there, also if we even hit our flush we will be OOP and it will be hard to extract value, folding is the safest play.
As played if Bet/Called flop
Turn: At least I'd just Bet/Fold here, we ain't getting any good odds anymore.
River: Even sad that you got that far, it's only a freeplay, don't have to fight for every pot. But as played you can likely go broke here, since he could still have some Kx type of hands, or even 2pair on flop. Next time make sure you fold on such spots on flop.

Don't fight over freeplays, a big mistake.
Best regards.