"Gokudera either. We can bring them a few extra blankets." Because Riku doubted Tsuna and Gokudera would want to share a sleeping bag like Sora and Riku did when it got to cold. But if they wanted to be stingy with body heat, that was their own problem. "Alright, put the cake in the oven."
Did Gokudera object to their relationship? Well... that wasn't an issue! "That's not the point," Gokudera dismissed Tsuna, "Sora had to take responsibility for this!" Because obviously it wasn't Riku who had started this unknown dating thing with Sora!