Pass. Perhaps they bid to 3NT, which will go down like 99% of the time
Since they bid 4♥, pass now. Our aces are over opener's kings, so all it takes is pard to have the spade trick and a side queen for this to go down. We have a choice of good leads vs 4♥ as well.
This is similar to another recent discussion about OBAR bids.
Personally I like to bid fairly aggressive here, but even still, we have an amazing hand for partner. I think this is worth a 3♥ call, then 4♠. I want to set a forcing pass, as crazy as that may sound.