NL100 QQ played passive

[Necromancer]

Vilian is 33/15/1.7 over only 100 hands. He may see me as a bit laggy pre flop but I haven't been out of line with him.

No Limit Holdem Ring game
Blinds: $0.50/$1
5 players
Converter

Stack sizes:
hero: $101
CO: $118.75
Button: $116
SB: $42.65
BB: $181.50

Pre-flop: (5 players) hero is UTG with
<font color="#cc0000">hero raises to $4</font>, <font color="#cc0000">CO raises to $7</font>, 3 folds, <font color="#cc0000">hero raises to $24</font>, CO calls.

Flop: ($49.5, 2 players)
hero checks, CO checks.

Turn: ($49.5, 2 players)
hero checks, CO checks.

River: ($49.5, 2 players)
hero checks, <font color="#cc0000">CO bets $20</font>, hero ??.