When Saeki first takes him out for camping on the beach, Ryou thinks it is a rather silly idea. They might be kids with a healthy immune system, but sleeping outside in the middle of winter is not exactly something one should do just for the fun of it. But even as he says so, Ryou consents, because this is Saeki, and Ryou would never let Saeki down.
So they take a tent and their sleeping bags and sneak out at night, when their parents think they are already sound asleep, and move to the beach. Ryou thinks the waves rushing over the sand, mixed with Saeki's even breathing is actually sort of calming, especially since he now has to sleep alone normally – without a brother to share his bed with.

The second time Saeki takes him there is in spring. It is not as cold as it was in winter, so they forego the tent and just sleep out in the open, the sparkling night sky clear in their view. Their parents haven't found out about their nightly trips and they both prefer to keep it that way, enjoying their company.
When Ryou spots a shooting star he does not bother waking Saeki up, but instead wishes upon it for them to stay this way forever. He never tells Saeki, but he is sure the other boy knows anyway.

In summer there is no need for either a tent or sleeping bags, and they lie curled up with each other in the sand, Ryou's head on Saeki's chest and his arm around Ryou's shoulders. He isn't quite as lonely anymore without Atsushi, because he has Saeki now to hold him, but at the same time he knows it is not quite the same.
They are both awake again when the sun rises, bathing them in the warm, golden light that makes them forget the worries they might have had.

When it is fall Ryou knows exactly why Saeki is not quite the same as Atsushi. He is not his twin brother, not his other half, but when Saeki cuddles up with him, in only his sleeping bag, pressing a light kiss against his temple, he knows he has at least found a love he can value just as much.

As winter comes again they no longer have to go camping – they sit inside of Saeki's house, by the fireside, each of them a cup of hot chocolate in their hands. And when Saeki smiles at Ryou, resting his head on the other's shoulder, they both know Ryou's wish has come true.