i just looked at mase's things and this may or may not work because robb and zoey have a fairly messy past hookup/fling type thing that didn't end well because he's a nightmare + they've recently hooked up again, SO it would depend on how much (or if) you think zoey would have shared something like that with him! if you'd be up for a bit of drama with it i actually kind of love the idea of mase being unaware while robb is FULLY aware and then finding out down the line.