... and the one after that ..

Vil says .. Hi, hope you’re up for another ‘progressive’ exercise. This time it is a match point session.
You are South and hold the following hand:

5
852
KQ63
KQT95

At favourable vulnerability you pass as dealer. West passes and partner opens 1NT (12-14). East bids 2S. No alert. You do not play Lebensohl or anything fancy in this situation. Your bid?