Awww, Riku was being cute. Sora continued to pet him even after his hair was fixed.
Tsuna reached out for Gokudera very carefully, brushing his shirt off a little. He looked at Sora with the same question in his eyes.
"Well...we just went on a few dates at first," Sora explained. "We didn't want to tell anyone cause we were just trying it out. Eventually we decided to be more serious." He gave Riku's hand a squeeze. "We were waiting for a good time to tell you I think." That was pretty much it.