I’m utg+1 with KK, 185 effective stacks. Utg limps, I raise to 15, mp calls, sb calls. 3 ways to a flop of 10h9h2s. Wet flop, $49 in the pot, I bet 40 to drive out any draws and protct my overpair, sb calls. $129 in pot, Kh turns, bringing both straight and flush draws, sb (60 year old white guy) plays with chips and looks like he wants to bet and mini tanks then checks, (he appears to be a thinking player) sb has about $130 behind, it’s about a pot sized bet. I check back, fearing a check raise, and wait to see what develops on river and see if sb does want to bet out. 2c rivers and I make top full house, sb checks, I bet $50 for value. He calls.
My question is how much to bet on river, and do I ever bet the turn when both draws hit? I’m never sure how much to bet on river in a fairly passive game where most players limp preflop and don’t seem to call shoves or larger sized bets.