CO seems like a decent player for these stakes, BB just sat down last orbit and has played alot of hands. Not sure what I should have done in this situation. I think CO could have a set or TPTK type hands, once BB pushes I think he could have set, 2 pair, flush, maybe pair+flush draw. With these ranges I am probably ahead. Is BB range more narrowed down to sets and flushes? And would CO mostly just call top pair hands instead of raise?

Full Tilt No-Limit Hold'em, $0.10 BB (8 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

Button ($19.54)
SB ($7.20)
BB ($8.70)
Hero (UTG) ($26.30)
UTG+1 ($19.10)
MP1 ($11.55)
MP2 ($3.87)
CO ($9.90)

Preflop: Hero is UTG with A, A
Hero bets $0.40, 4 folds, Button calls $0.40, SB calls $0.35, BB calls $0.30

Flop: ($1.60) 3, K, 9 (4 players)
SB checks, BB checks, Hero bets $1.50, Button raises to $4, 1 fold, BB raises to $8.30 (All-In), Hero raises to $25.90 (All-In), Button calls $15.14 (All-In)

Turn: ($48.18) 10 (3 players, 3 all-in)

River: ($48.18) 5 (3 players, 3 all-in)

Total pot: $48.18 | Rake: $2

edited because the Converter is finally working for me.