villain is a loose donk and called almost anything preflop. was his line more like made straight on the river? whats the better line on my part? block river bet or check/ induce bluffing?

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

UTG ($363.45)
UTG+1 ($113)
MP1 ($204.75)
MP2 ($99.60)
MP3 ($503)
CO ($77.40)
Button ($180.80)
Hero ($199)
BB ($341.50)

Preflop: Hero is SB with T, 8.
2 folds, MP1 calls $2, MP2 calls $2, 3 folds, Hero completes, BB checks.

Flop: ($8) 8, 7, T (4 players)
Hero bets $6, BB folds, MP1 folds, MP2 calls $6.

Turn: ($20) 5 (2 players)
Hero bets $15, MP2 calls $15.

River: ($50) 6 (2 players)
Hero ?