The sensation of being stretched like this did and had always lingered between 'weird', 'uncomfortable' and 'pleasant'. Over time as Ryuutaro got used to everything it had gravitates more and more towards pleasant though, which he was thankful for.
It was not helping him think more clearly, but then again that wasn't needed all that much. In the end, what did it matter where? As long as it happened and there was absolutely no way around that right now.

As the kiss ended Ryuutaro leaned his forehead against Hayato's shoulder, catching his breath for a second. "C-couch... sounds acceptable."
But no matter what, if he was expected to speak then it would be correct phrases. If Hayato could muster up the self control to speak properly, so could he (ignoring the fact that he was just... not as able to). That he just practically said the first and easiest word coming to his mind was just a minor setback in the grand picture.
And because talking was still annoying no matter what, Ryuutaro changed his actions to lightly kissing over Hayato's shoulder and upper chest. Took way less brainpower after all.