You Make the Call

Two nights last week, I encountered situations where I felt a bit "stuck" as to what to do with a hand. Since I know Chilly loves it when I post hands that I mis-played, consider these two very similar scenarios:

Hand No. 1

Villian is a tight regular from the now mostly defunct Mirage 10-20 FLHE game. He is sitting 1-2 NLHE while he waits for a seat at 8-16 FLHE. We both have about $400; nobody else has more than $200. He raises two limpers to $15. I have the button and AsKc. I call; both limpers calls for a $60 pot. The flop comes down K-8-2, three suits. Checks to Villain who bets $50. Action is now on me.

Hand No. 2

Villian has been at the table 30-45 minutes. Seems to know what he's doing but hasn't opened for a raise yet. He has about $220, nobody else at the table has more than $150 except me (about $400). Villian raises one limper to $15. I have the button and TsTc. I call; limper calls also for a $45 pot. The flop comes down 9c-4c-4s. Checks to Villain who bets $40. Action is now on me.

For both hands, the question is: given how I have played the hand to this point, what should I do now? I'm not interested in any discussion of my pre-flop action. I know a case can be made for re-raising pre-flop but in both of these instances I chose to call. Having done that, what is the best response to Villain's flop bet?