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It must be something to do with the fact that the brain is a muscle, taking its shape and defining itself over years, there's no other reasonable explanation in his mind as to why he's not panicking and crying at the sensation of his (new) hands against the body he's now inhabiting.
(It must also be what's keeping him from feeling like that body doesn't belong to him.)
Whatever it is, Cale— no, Kim Rok Soo can't help but touch in the most delighted awe, a shiver running down his back as her fingers trace a line between a pair of freckles on his shoulder.
A part of him is still puzzled, after all this body is almost completely different from his original one, almost like a blank canvas, with no major blemishes or scars or any sign of previous injuries. The latter is not entirely a surprise, the original Cale had not yet crossed paths with Choi Han or had been beaten to a pulp by him.
A part of him feels strange to be touching a body, even though it is he who is inhabiting it, but he is really unable to stop himself. He avoids many places though, he doesn't want to push his own luck and end up triggering a nasty reaction, nor does he want to ruin the fantastic of the moment.
He can't even remember the last time he clasped his cold hands together without starting to hyperventilate after he lost his concentration for a couple of seconds and his brain stopped recognizing his limbs as a part of him.
It must all be over in a moment, of course, and Kim Rok Soo knows that, which doesn't stop him from almost whimpering when he hears Ron knocking on the bathroom door.