KK makes straight vs tag

[praios]

Stage #812876662: Holdem No Limit $4 - 2007-11-08 19:01:08 (ET)
Table: BERRIAN AVE (Real Money) Seat #2 is the dealer
Seat 2 - HILLKLIMER ($258.46 in chips)
Seat 3 - FOUSEKIS ($960.30 in chips)
Seat 4 - POKERLEADER ($1214.48 in chips)
Seat 5 - hero ($1246.50 in chips)
Seat 6 - MEDEVIL ($828.35 in chips)
Seat 1 - TOMA21031 ($410.62 in chips)
FOUSEKIS - Posts small blind $2
POKERLEADER - Posts big blind $4
*** POCKET CARDS ***
Dealt to hero [Kd Ks]
hero - Raises $14 to $14
MEDEVIL - Calls $14
TOMA21031 - Folds
HILLKLIMER - Folds
FOUSEKIS - Folds
POKERLEADER - Folds
*** FLOP *** [10h Js Qh]
hero - Bets $22
MEDEVIL - Calls $22
*** TURN *** [10h Js Qh] [Ah]
hero - Bets $51
MEDEVIL - Raises $150 to $150
hero - Calls $99
*** RIVER *** [10h Js Qh Ah] [8d]
hero - Checks
MEDEVIL - Bets $200
hero ????

villian is playing 21/12/1.9/27. i thik he can not valuebet something less than a K here. more likely he has a flush. maybe he is just bluffing but i do not know if he has the balls to fire thr turn and the river with air. so that to do?