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i think they look happy and comfortable which is really important in portraiture. they look fairly natural, but a little bit on the playful side for the most part but only a handful of images where it feels more like romance (which may not be important for everyone). processing looks fine and clean.
that said, i think you could have done more with composition and framing. you started to expand a bit with 11 and 12, but aside from those two, most of the photos are cropped fairly tight with the subject dead center, leaving the image fairly uninteresting for anyone but the couple (and their friends).