Villain was 20/0 over a mighty sample of 15 hands, and had done nothing noticeable in said hands.

Do you think we will get calls from two pairs enough to push this river, or is this the easiest check behind in the world?

Party Poker No-Limit Hold'em, $2 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

Hero ($215.60)
MP2 ($241.95)
MP3 ($213.45)
CO ($241.68)
Button ($82)
SB ($803.30)
BB ($325.55)
UTG ($204)
UTG+1 ($39)
UTG+2 ($95.35)

Preflop: Hero is MP1 with , . SB posts a blind of $1.
UTG calls $2, 2 folds, Hero raises to $9, 5 folds, BB calls $7, UTG calls $7.

Flop: ($28) , , (3 players)
BB checks, UTG checks, Hero bets $25, BB calls $25, UTG folds.

Turn: ($78) (2 players)
BB checks, Hero bets $50, BB calls $50.

River: ($178) (2 players)
BB checks, Hero shoves 131$