About bluffing weak bets

[Nick Royale]

10 handed 100NL. Villain is a decent, but not very thinking, straight forward 20/8/3ish player.

Preflop
Villain raises 4bb from MP, you call with 88 in LP, everyone else folds

Flop K62, two of the same suits (pot 9bb)
Villain bets 5bb, you call.

Turn 5, not completing the flush draw (pot 19bb)
Vilain bets 5bb, you?


I'm not sure if my example is good, but often I find myself in situations where I could be ahead but easily be behind to a QQ-99 hand. Is a raise to 20-25bb here with the intention of not putting in any more money a good idea? It basically turns my hand into a bluff, but should often get these PPs to fold. I might get called by a FD and be good when I check the river, but most often I'm behind on a SD. How do you read villains hand?