Frederico, I would say that yes, it is C. Portia. Yours looks just like mine (see below). And this hybrid did inherit a very nice fragrance (which I assume comes from the C. labiata instead of the stinky-flowered C. bowringiana parent). And be forewarned, if your plant hasn't attained a giant size yet, it certainly will if you keep it happy. Congratulations on the blooms. They're lovely.