MP is fish, BU is 17/12 and seems like a tag.
He had 4bet 50% over 6 hands - and I am aware that this is a small sample but I mean I think it's enough to say with a pretty high confidence - that his 4-bet range is pretty wide - and I have got blockers to KK, AA anyway.
$0.10/$0.25 No Limit Holdem
FullTiltPoker
7 Players
Hand Conversion Powered by weaktight.com
Stacks:
UTG ($16.87)
UTG+1 ($25)
MP ($28.68)
CO ($21.10)
BTN ($31.63)
Hero ($25)
BB ($28.06)
Pre-Flop: ($0.35, 7 players) Hero is SB K♣ A♠
2 folds, MP calls $0.25, 1 fold, BTN raises to $0.75, Hero raises to $2.40, 1 fold, MP folds, BTN raises to $6.25, Hero goes all-in $25, BTN folds