Full Tilt No-Limit Hold'em, $1 BB (9 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($65)
BB ($100)
UTG ($104.15)
UTG+1 ($21.70)
MP1 ($124.40)
MP2 ($94.50)
Hero ($99.50)
CO ($45.85)
Button ($100)

Preflop: Hero is MP3 with K, K.
1 fold, UTG+1 checks, MP1 calls $1, MP2 calls $1, Hero raises to $9, 1 fold, Button calls $9, 2 folds, UTG+1 folds, MP1 calls $8, MP2 folds.

Flop: ($30.50) 5, T, 6 (3 players)
MP1 checks, Hero bets $25, Button calls $25, MP1 raises to $75,

Any thoughts?

Without a very precise read on villain as being an absolute maniac I fold here. I expect to see 555 or 666 here almost every time.