It's not a lot but Ruca can indeed feel warmth of the other's hand through fabric. That fact (as well as Konoha's gesture) surprises him enough to look at the other again.

Surprise vanishes quickly from his face replaced with gratitude, but Ruca himself stays silent for a long moment, unmoving. His gaze slowly drops from the other's face then Ruca unwraps one of his hands from the blanket and hesitantly places it over Konoha's hand.

"...Warm." he says softly, almost as if he doesn't believe he can feel anything but coldness.

It feels so warm.