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Katsuki grabbed Izuku's hand, the cold of the metal seeping into his skin. Without a moment's hesitation, he brought the back of the prosthetic to his lips and pressed them softly. A sharp gasp brought his head up and he locked eyes with the love of his life.
"Kacchan... I can't feel anything on that hand." Izuku trailed off, his gaze wandering off to the side.
"I know. Just keep your eyes on me, nerd." Katsuki huffed gently, a glimmer of a smirk on his face, before flipping Izuku's hand up, palm facing him.
He waited to see those shimmering emeralds glance back to him before he closed his own eyes, pressing a kiss to presented palm. He trailed his lips over to the tip of his thumb, pressing lightly there. Followed by the metal forefinger, then middle, then ring... One by one, Katsuki took his time worshipping the tips of the fingers of his partner.
He never opened his eyes to check if Izuku was watching him, he's known that burning stare all his life, could feel his gaze branding his skin.
Slowly, he tipped the hand down again to place a second kiss on the gleaming surface on the back of Izuku's hand. Again, he brushed his lips reverently slow up the metal appendage, pausing only to press his love into the worn joints. Stopping longer for a moment at the connection point, the touch of his lips firmer, followed by a heavy breath.
Izuku hadn't made a sound. The only sign of life being the soft tremble under the skin of unshed tears. He felt as though any movement would break whatever spell Kacchan seemed to be under and so much of him yearned to see how this would end.
After his moment, Katsuki carried on his journey, brushing his nose up the freckled shoulder. A line of, again, soft kisses led up his neck, past his ear, and landing on the long scar Katsuki knew as well as his own, now hidden by bouncing green curls.
Another firmer press of his lips there and downward he went, covering every patch of jagged skin and missing freckles until his finally reached the other's lips.
Izuku let out a shuddering gasp, this time the tears won and spilled over his cheeks. Katsuki lingered another moment grazing his lips over but not touching again after the initial kiss. Noses brushed and foreheads rested against each other before Katsuki finally opened his eyes again. The green eyed partner couldn't find the strength to tear away from the other's soft gaze, the waterfall down his cheeks poured harder in the silence.
"I love every single piece of you, original or new." The quiet murmur gently flowed in Izuku's ear and nestled in the lining of his heart, a declaration he felt in the depths of his soul.
And soon, the pain began to ease...