100NL: river OOP: hit set on very drawy board

[jimmy44]

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.50/$1
Seat 2: Hero ($110.90 in chips)
Seat 3: Button ($100 in chips)
Seat 4: SB ($66.25 in chips)
Seat 5: BB ($11.00 in chips)
Seat 6: UTG ($105.40 in chips)
Seat 7: UTG+1 ($21.50 in chips)
Seat 8: MP1 ($186.25 in chips)
Seat 9: MP2 ($100.00 in chips)
Seat 10: MP3 ($124.50 in chips)
9 players
Converter

Pre-flop: (9 players) Hero is CO with T T
5 folds, Hero raises to $4, Button calls, 2 folds.

Flop: 8 J Q ($9.5, 2 players)
Hero bets $6.5, Button calls.

Turn: T ($22.5, 2 players)
Hero bets $15, Button calls.

River: 7 ($52.5, 2 players)
Hero checks, Button bets $40, Hero ???

Button just sit down on the table.
Without no reads/stats, villain can have a huge number of hands, can you fold here?

[BankItDrew]

Why would villan bet so much on a draw heavy board?

1) villain has made straight or flush
2) villain is bluffing

Is villain the type of player to bluff in these spots? If answer is >30% of the time ~ call.

[jimmy44]

I agree with you, however, as villain is unknown I'm really lost here ...

[wesrman]

Wow, tough spot.
I think you have to fold, because too much can beat you.
One of those cards has to have helped him.
My guess would be that he made the flush, but what do i know...lol.