[vanitas]

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Certainly no sense in raising now. Call and reevaluate on the turn?

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Surely, calling will be the save way. If a blank hits, in a usual game i'd raise or even three-bet the turn to make draws pay. Although with bad-loose and passive players you might simply want to check-call down to the end if not raised and no flush card hits, since they probably tend to stay in on close odds.

I'd definitely fold to a raise from MP on the turn, since a tight-passive player raising usualy means a decent hand, at least top pair with good kicker. If a flush card hits, fold to any call, even against loose-bad, since you have so many ways of losing. Don't raise MP if all others are out to see if he was on draw - he very probably wasn't, since almost any tight-passive player I know would check a draw on the flop.

If you hit a straight draw and no flush card hits, be more aggressive, as MP is not on a draw and you have two legitimate ways of winning.