picking off busted draws ok here?

This is late saturday night Bodog 200nl FR.

no spectacular reads, but villain seems donkish. He limps in a lot, and seems kinda aggro post flop based on this one hand -
he completed the SB with 66, then bet the flop and turn about 2/3 pot on a heads up draw heavy board with 2nd pair only.

I have $210 and get A:spade: T:spade: in the BB, villain is in the HJ and covers me.

pre flop - villain and 2 others limp, SB completes, I check.
(also, one person posted a blind oop and open folded, hehe)

Flop - K:club: K:diamond: 7:heart: ($12)

checks through.

Turn - K:club: K:diamond: 7:heart: T:club: ($12)

I bet $7, villain and SB call.

River - K:club: K:diamond: 7:heart: T:club: 8:spade: ($33)

SB checks, I check, villain bets $30, SB folds, I call???

The over-call concerns me, but I don't hate this call.