Nut flush + Nut Lo Draw

[wackjob]

10-handed, $1-$1 PLO8 Eurobet.

This is from memory, mainly my question is this: is this an OK spot to slow roll. Typically I never slowplay in O8, but every now and then I feel I have a good spot to do it. What do you think?

about 5 people limp PF as do I.

Flop gives me the nut flush and the nut lo draw. turn is an offsuit 9, no pairs on board yet.

1 guy donked the flop for about 50% bet and it folds around to me. Do you raise here or wait ?