Played yesterday a home game, $1/$2, 6 players.
Villain I has $19 and was playing hyperagressively, loosing $500 to the moment, i.e. he is tilting and knows it and doesn't care.
Villain II is tight and passive, usually underbets good hands. His stack is $450.
Hero tries to play TAG, at least is regarded as such at this table, his raises usually get some respect. Recently bluffed a couple of times on the river, was never caught, but showed the bluff. The stack is $350.

Villain I is UTG straddles for $4
HJ folds
Villain II is on the CO calls $4
Hero is on the Button with 95, desides to call $4 in position
SB folds
BB folds
UTG checks, pot $15

Flop
68T

Villain I all in for the rest of his stack ($15)
Villain II calls ($15)
Hero calls ($15)
Main pot $60

Turn
T
Villain II checks
Hero checks behind

River
7

Villain II says "Bet $50", but throws $25 in the pot, and the public says it should be treated like this.

I've got a straight, but since he's tight he really has something, at least a set and his check was just SP. So call or RR?

It is a home game so home game ranges are in play 95 soooooted

Your call on the flop is with pretty poor odds with only a backdoor flush draw and the gut shot to a straight that requires a 4-straight board. The visibility of the straight means your implied odds are low while not having the nut straight means reverse implied odds are a big problem. You dont stand to make much money but can easily lose a lot.

The turn brings you extra equity with the flush draw and at least that will be somewhat disguised if you make it. Unfortunately the paired board means you still have a reversed implied odds problem if you make your flush.

Could you have bet the turn and expected folds from the tight villain? I think he probably folds anything worse than trips to a reasonable bet.

Trouble is you don't actually have a hand that beats the allin player on the turn with 9-high so you don't actually want to push out the player you can get paid by if you do hit river. Therefore I think check behind turn is correct.

River villain announces $50 and puts in $25. Really that should be a $50 bet and he should put another $25 in. I don't think villain has a primary strength hand (quads/boats). He could have trips but he most likely has a 9 too. Trips and better would have bet the turn when the board was 3 to a straight and 3 to a flush.

Because villain could have J9 you are not really in a spot you can raise for value here. I'd just call the river bet expecting to split the pot quite frequently but not surprised to see J9.

In future in this spot I would not bother entering the pot vs the short stack on tilt with speculative hands (particularly bad ones like 3-gappers). Instead I'd raise him so he is allin uf he calls. Do it with hands we expect to have decent equity against his calling range (any two cards?). So AX, pairs and QJ/KT+

Yeah, you are right, the call on the flop was veeeery loose. ) The VI's range was ATC, so with my gutshot draw I thought I still had chances.

But the question still stands: if I had eg A9 and faced this bet on the river. What's the best action?

I just clicked to see what a "densed" board was. Still not sure I know.

Stack sizes blow for a preflop limp. The steaming player is going to shove a lot on the flop, which is playing almost perfect against us, and the tight player will fold, and there's no real way to make money. Or the tight player will call, and while we're deep against him, we're left with a hand that is unlikely to be the best hand at showdown so we have to fight over a dry side pot. Or the steaming player will check, the tight player will bet, and now we're left trying to figure out how to wrest a super strong range out of the one player's hand while also getting the loose shortstacker to fold. Or both players will check, and we still have to worry about getting the shortstacker off his hand with our GSSD+BDFD type **** that's terrible for getting loose players off of hands with no money left behind. Or we'll miraculously hit an all diamond flop, but we're only getting $15 from the loose player, and the tight player isn't paying us off very much when we're bombing money into a sidepot because he's tight, so that wasn't very much worth the money we paid to see a flop at all.

Postflop: well, it looks like we hit one of the better flops we could hope for, and one of the ****ty scenarios I listed happened.

Raise river. There's no way villain thinks his Tx is no good on this board.