It would be a lie to say that Ryuutaro didn't feel a bit self-conscious about being so exposed. Especially in combination with aroused and flushed. He feels the need to look of to the side as Hayato looks him over, but then just smiles. Because he would certainly not show any kind of doubt about anything. And because he knew he was pretty. Arrogant, self-centered kid he is.
When Hayato touched him, he couldn't help but let out a tiny moan. And then more muffled sounds of pleasure as Hayato came closer again.
The boy wrapped his arms around his lover's neck, leaning in to kiss him. That way he could both, stabilize himself and... well, do something.