[The encouraging sounds are all Otto needs to keep his focus on that particular area, splayed hands rubbing and stroking. The webbing between his fingers probably serves to make the sensation even grander. On occasion, his hands will curl and sharp fingernails will run along Bruno's skin, just to add a pleasant little sting.
As for Otto himself, while the kiss does grow a bit more intense when his hair is tousled, the real reaction doesn't happen until Bruno's fingers are near his spine. That's when he gasps into the other man's mouth, his muscles tensing up from the overwhelming sensation. The scars left by the nanowiring are no more than tiny dots, but they run all along the length of his back and that whole area has become sensitive as a result.]
Haah... Oh god... [It's a deep whisper, muffled against Bruno's cheek.]
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As for Otto himself, while the kiss does grow a bit more intense when his hair is tousled, the real reaction doesn't happen until Bruno's fingers are near his spine. That's when he gasps into the other man's mouth, his muscles tensing up from the overwhelming sensation. The scars left by the nanowiring are no more than tiny dots, but they run all along the length of his back and that whole area has become sensitive as a result.]
Haah... Oh god... [It's a deep whisper, muffled against Bruno's cheek.]