What will you bid as South?

What will you bid as South?

Against 2NT, you led the ♥6 (to your partner's suit). Dummy played low, partner followed with the ♥J, and the declarer won with the ♥A and played the ♣Q, which your partner won with the ♣K. Partner continued with the ♦6, and you won with the ♦K (declarer followed with the ♦3). What will you do next?

You play 4♥ and West leads the ♣K. How will you play?