Merry Christmas!

Party Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
6 players


Stack sizes:
UTG: $133.50
UTG+1: $77.40
Hero: $182.95
Button: $110.80
SB: $88.10
BB: $19.95

Pre-flop: (6 players) Hero is CO with
2 folds, Hero raises to $4, Button folds, SB calls, BB folds.

Flop: ($9, 2 players)
SB checks, Hero bets $8, SB calls.

Turn: ($25, 2 players)
SB checks, Hero checks.

River: ($25, 2 players)
SB bets $14.5, Hero calls.

Results:
Final pot: $54

I hate checking this turn, but I can't for the life of me figure out what calls that I beat or folds that beats me. I wouldn't usually bet air here (I feel like I see JK and QK all too much), hence I checked.

I'd probably fold to a pot sized bet on the river, but $14.5 looked valueish/donkish bluffy enough for me to call. Thoughts? Is this standard?