NL20 HU 99 Flopped Set On Wet Board

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.1/$0.2 No-Limit Hold'em (2 handed)

Known players:
[tg]SB$9.10:///////;BB (Hero)$20.00:///////;[/tg]

Preflop: Hero is BB with 9:d, 9:h.
Hero raises to $0.60, SB calls $0.40.

Flop: ($1.2) 9:c, T:d, 8:d (2 players)
SB bets $0.20, Hero raises to $0.80, SB raises to $1.40, Hero raises to $3.00, SB raises to $4.80, Hero raises to $20.20, SB calls $3.90.

Turn: ($29.1) 9:s (2 players)

River: ($29.1) Q:h (2 players)

Final Pot: $29.1.
Results follow:

Hero shows four of a kind, nines(9:d 9:h).
SB shows a straight, queen high(J:h 7:s).

Hero wins with four of a kind, nines(9:d 9:h).

Board is ugly, and I decide that because it is so wet and ugly he could be doing this with tons of draws/two pairs. Villian is a complete unknown. This is in the first 10 hands of the match.