Hello faronel,
Flop: Raise the flop and protect your hand, if he has any kind of draw or Kx hand he is willing to pay anyways. Not a great spot to slowplay.
As played
Turn: Not much you can do, we can't really get away while he could also have worse set like 66 and of course a lot of 2pairs/pair+OESD. But you should have done the raise already on the flop.
Best Regards.