Poker Stars, $0.10/$0.25 No Limit Hold'em Cash, 6 Players
BTN: $26.50 (106 bb) 50/0 (6h)
SB: $25 (100 bb)
Hero (BB): $25 (100 bb)
UTG: $17.02 (68.1 bb)
MP: $61.32 (245.3 bb)
CO: $39.26 (157 bb) 16/11 (37h)
Preflop: Hero is BB with 5

4

2 folds,
CO raises to $0.50, BTN calls $0.50,
SB folds, Hero calls $0.25
Flop: ($1.60) 6

Q

7
(3 players)
Hero bets $1.20,
CO folds,
BTN raises to $2.50, Hero calls $1.30
Turn: ($6.60) 3
(2 players)
Hero bets $4.40, BTN calls $4.40
River: ($15.40) 3
(2 players)
Hero checks, BTN checks
Results:
$15.40 pot ($0.69 rake)
Final Board: 6

Q

7

3

3
BTN mucked Q

T

and lost (-$7.40 net)
Hero showed 5

4

and won $14.71 ($7.31 net)
I realise I only have a microscopic sample on BU but he has played 3 out of 6 hands without ever raising so I suspect he is a fish.
Preflop: I hate myself for such a fishy line in calling OOP but raising seems pointless (I don't expect to take this down preflop, so why bloat the pot with a bad position?) and pot odds ftw.
Flop: I think donking out is a bit more convincing than x/r (donk looks like I'm protecting a top pair, but x/r doesn't rep much imo because a strong hand would not risk a check behind on such a drawy board). Sizing could have been slightly bigger though. Getting minraised sucks but I think I can call for these odds.
Turn: hit the nuts, bet for value.
River: paired board sucks slightly. He has some kind of hand after raising the flop and calling the turn. I opted for check/call thinking that he was very polarised (either a set that just filled up, or a missed flush draw). I think that was the wrong choice and I was far too cautious about the possibility of FH; given that he seems a bit fishy / passive I should bet/fold the river to get more value from his showdown value hands (Qx and whatnot).