Jayne watches.
Simon's on the bed, spread eagled, begging for more. Mal's between his legs, fingernails scraping, just beyond pleasure and beneath pain, along the delicate, pale skin. Simon whimpers; Jayne watches.
Mal balances over Simon, knees straddling his hips, hands gripping wrists almost bruisingly. Jayne watches as their hard cocks slither against each other, and they groan in unison.
Simon tries to thrust upwards, twisting for more friction, more pressure. Mal pulls back, an indecipherable look on his face. "Please," Simon begs. "I need it."
Jayne watches as Mal takes a fingerful of lube, and thrusts it into Simon's ass. A low, animalistic whine escapes Simon's throat as he fucks himself on Mal's hand. Hips snapping and flexing, the boy wordlessly pleads for more, and Mal gives it to him, adding fingers, and pushing and opening and widening the tight hole, preparing his body for what comes next.
A long, smooth, slow push in, and the only sound in the room is breath, hot and heavy, for a stretched-out moment. Jayne's eyes are riveted to the juncture between cock and ass, and he holds his own breath, waiting for...
There. Mal is pushing Simon's legs up to his shoulders, straining arms holding him above. His ass flexes with every thrust; Simon moans, his cock twitching and leaking. Simon clutches at Mal's arms, trying to grip onto his leverage, but failing. Every time Mal moves, it's like an earthquake running through Simon's body.
Jayne moves his hand, clutching at his own neglected organ. The sound of skin on skin, tangible sweat, and the smell of hot arousal surround him. He doesn't stroke, not yet; he's too keyed up for that. Mal looks like he can go for a long time yet, and Simon's not been given permission. Really, the whole thing works best if they all can come together. So he waits, and feels his dick throb underneath his hand.
Mal takes his time, indistinct murmurs falling from his mouth, each stroke nice and easy. Simon sweats, teeth closed over a lip, wanting to beg, unable to do anything but moan and squeeze and close his eyes in pleasure.
Those blue eyes pop open when Mal changes his angle, thrusting faster, harder. Jayne has misjudged; Mal's on the edge, and about to force Simon over it with him. Jayne grips his cock, using his own pre come as slick, squeezing and stroking and twisting, and groaning in tandem with the two men on the bed.
Simon whines, and convulses, and bites back a scream as his cock spatters come over his stomach. Mal grunts, and pushes himself in as deep as his can go, shuddering. Jayne curses as hot fluid spills over his fist.