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Gen twirled a loose strand of Senku's hair with a delicate finger, half his body laying on the scientist's lap, stormy gaze soft and low in the cold sharpness of the Observatory. Senku watched the man beneath him with amusement, fixating on the way the mentalist's lips twitched.
"Come on, mentalist. I know what you're here for." Senku drones, biting back a slight smile, eyes shutting lazily.
"What, can I not spend time with the savior of humanity, dear Senku?" Gen pokes, leaning back and settling comfortably across Senku's thighs. His fingers moved with a lithe gratefulness, curling the green faded strand around and around, over and over.
Senku yawns, thudding his head against the Observatory's wall, the strand abandoning Gen's fingers, "I've got things to do to make that come true."
Gen hums in response, hand falling to his chest. Gen stretches his legs with a subtle grunt as he makes himself comfortable on Senku's lap and the temporary sleeping mat, eyes fluttering shut, head leaning against the scientist's stomach.
Senku looks back to Gen, peering down at him quietly, inspecting the details of the mentalist's sleep-drunk face, reminding himself Gen is never usually up this late into the night.
Gen's lips are ever so curled into the smallest of smiles, warm in the freezing air. His eyebrows are slack, eyelashes resting against his pale cheeks, his face precious like a gem.
The scientist's hand reaches before he could think twice about it, brushing the silky black hair from Gen's face. With a content sigh, the mentalist leans into the touch, careful and delicate like Gen might shatter if he's too rough.
"Mm. Senku." Gen hums into the cold winter atmosphere, barely audible over the sound of eachother's breathing. Senku swipes his finger over the mentalist's dark eyebrows, tracing along the bones of his soft features.
Senku's heart hurts. His fingers feel freezing against Gen's skin, yet at the same time the mentalist's face is like a block of ice on his skin.
There is work to do still…
The scientist leans down, eyelids low, lips brushing against the softness of the mentalist's. Gen pauses, a subtle laugh escaping the back of his throat as he leans into it.
It could wait for tomorrow, irresponsible as it is.
Senku retreats an inch or so, smiling like it was their first kiss all over again.
"Was this what you were here for?" Senku inquires with a jesting tone, already knowing Gen's answer.
Without opening his eyes, Gen hums as he nods. Senku tacks on an "Of course," as he pecks the mentalist on the lips again, the two giggling as Gen pulled his chin closer.
Senku's eyes fluttered shut, mind hazed with exhaustion and a fuzzy sensation, like cotton was engulfing his brain. Gen litters kisses all over the corners of his mouth, aim messy and goofily inaccurate.
Gen's tongue eventually breached Senku's lips, lapping lazily at his teeth until they relented, giving way to his tongue. The job's so sloppy Senku can't help but smile, missing Gen's lips entirely when they parted for air, all the while snickering like teenagers.
Senku's teeth clatter against Gen's as the mentalist sits up, two hands cupping the scientist's face to keep him still, nibbling on his bottom lip like a damn chew toy. Senku's eyes lull open, his own hand trailing to the nape of Gen's neck, running his fingers through the base of his hairline.
Gen moves back, his eyes finally falling open, a grey blue in the dim moonlight. Senku wipes his slobbered lips, chuckling breathlessly as he stares at Gen with lidded eyes.
"I love you, Gen," he drawls, carding through the mentalist's hair. Gen smiles sheepishly, placing one last kiss to the spot of Senku's cheek warmed by his palms.
"I love you too, Senku." He hums against his skin, head falling against the scientist's shoulder, legs off to the side.
Senku thinks despite sleeping against the wooden wall, it was the best sleep he's gotten in weeks.