[Kronon]

Slowplaying the nutflush is almost always safe. The only hand he could have that can beat you with one card is a set or a twopair, and twopair seems very unlikely here. Besides, he would hardly check with those hands on a dangerous board.

So I would check behind him, which will make it almost impossible for him to read you. You could have 2 high cards, a K, a medium PP, and he might vert well take a stab at the pot after the river which you obviously will raise.

Further, if he does check the river and you put him all-in, it will look like a bluff and you might get called by a medium pair or even AQ.