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Gai pants harder on top of him, one hand next to this gray hair, the other on the headboard of the bed. He has his eyes closed, concentrated, seeking to increase the rhythm of his hips and slow down when the itch of stasis seems about to explode, evidenced by the drops of precum that eagerly emerge from the tip of his penis. That vicious cycle soon became maddening, and Kakashi only manages to grab his tanned side and push himself deeper and deeper, but Gai doesn't give in and maintains that back-and-forth of intensity.
"I want to come." Kakashi complains, and his voice sounds too deep and too much like a hissing moan.
"Good." Gai relaxes his pace, and Kakashi is about to flip them because Gai is teasing him on purpose until he feels his inner muscles tighten around his cock.
Kakashi bends his knees and lifts his hips deeper and moans and gasps and grabs Gai's shoulder to bring it down and crash his lips, mistakenly, on his collarbone, cutting the thin skin, jaws closing almost reflexively. Noticing the coppery taste of blood, he releases his mouth and apologizes, immediately.
Gai flexes his elbows and gasps into his forehead. "Okay." It seems, almost, as if he's forgotten more than just shuddering in his lap, and Kakashi feels, somehow, proud to have such an effect on him, a taijutsu master who always has his body under control, at all times, everywhere, except when he has his legs open and receiving him inside the sensitive flesh of his internal muscles.
At some point, while he himself lost it a little and grabbed one of Gai's knees to hold him closer and getting Gai to just thrash in his lap, the larger man shakes and moans vigorously. Kakashi thinks of some definition to help him describe how compressed his penis feels.
"It's like a.... twisting tension cable, having sex with you."
Kakashi hears a crack, and thinks that every time he looks at that chipped square of the headboard of his bed he'll remember this.