Riku did stop long enough to hug his boyfriend back, because it made him feel a tiny bit better. Maybe he just needed to hold onto Sora for a few hours until his mood imporved through osmosis. But it sadly, wasn't really an option.
Meriweather poked her head out of the adjoining room, surprised to see him. "Sora? You and Riku are back before I expected you. Did you have a nice time?"