villain is LAGG 44.6/14.9/12( flop aggression) around 106 hands. By the river, i figured i had the best hand for sure. when river flush complete, my hand just turned into bluff catcher and could beat anything but flush. Should i throw out a small blocking bet, C/C or fold ? By the way, i've been struggling in these situations oop in the last couple of weeks.

PokerStars No-Limit Hold'em, $2 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($271.25)
Button ($137.05)
Hero ($198)
BB ($169.95)
UTG ($167.70)
UTG+1 ($117)
MP1 ($37)
MP2 ($241.45)
MP3 ($124.45)

Preflop: Hero is SB with A, 8.
1 fold, UTG+1 calls $2, 2 folds, MP3 calls $2, CO calls $2, Button calls $2, Hero completes, BB checks.

Flop: ($12) 8, 9, A (6 players)
Hero bets $8, BB folds, UTG+1 calls $8, MP3 calls $8, CO calls $8, Button folds.

Turn: ($44) 5 (4 players)
Hero bets $30, UTG+1 folds, MP3 folds, CO calls $30.

River: ($104) 5 (2 players)
Hero checks, CO bets $95, Hero ??