I got myself into a friendly after hours NLH 0,20 0,20 €
Stacks are rather deep, I have the lowest effective stack of around 40 €
4 players are left, and the game is rather loose and splashy, me being the tighter aggressive player among the 4.

straddle is on. I am in the SB.

Preflop
UTG call
BU fold
Me SB - JJ - raise to 1,60
BB call
UTG fold
Pot (3,60)

The BB is the only player that is a tad less splashy, a bit more thinking than the other players, but still fairly splashy, fairly out of line as could be expected at a friendly 20 cents game

Flop T54 rainbow
me - bet 2,00
BB - call
Pot (7,60)

Turn 9 complete rainbow
Now this specific player had very recently floated me similarly, betting around 3/4 pot after my turn check OOP. It felt very theftlike.
me - check for pot control and allow for blufs
BB - bet 6,00
me - call
Pot (19,60)

River 7 (suits of no matter)
me - check
BB - Bet 12,50
me - ???

Looking forward to your feedback.
B.

Bet the turn.

Continue betting for value with your Overpair on the turn. Your opponent likely has many Tx hands, and they to continue paying you off.

I normally do bet the turn, but I decided to mix up due to the hostile float bluf (I believed it to be). Is there any merrit to that?

I do not think the actual hand matters, because as it turns out he was doing something unusual with 56. I am even unsure whether it were defensive bets or blufs. I think one of each ... but it put me in one akward spot.

You checked to allow him to bluff, then he bets, you call on the turn. He did what you anticipated. The assumption here is that he would give up on river? In such a micro stakes game I’m not sure someone gives up a bluff once they go that route. He also could be betting what he thinks is for value with AT, KT, QT, JT, etc. As played I call but am not thrilled, just because you gave him the space to bluff and he’s taking the line you opened up for him.

I would check the flop with my entire range, and have a robust check-raising range, in which I would include JJ on this board.