Chapter Text
After years of brutal training and preparation, Cross was finally sworn in as an official member of the Royal Guard. As such, XGaster decided to reward him.
Cross was stretched over his father's lap, pelvis bared to the air, for now. As if summoned, XGaster tapped his son's pelvis. “Come now, male ecto, like I taught you,” there was no room in his tone for argument. He withdrew his hands for a moment, just long enough for Cross to follow orders.
When his bones became cushioned by soft purple ecto flesh, Cross braced himself.
XGaster wasted no time, one hand held Cross down by his spine, while another pressed two wet fingers to his ass. The barest hint of claws against the sensitive flesh was his only warning before they pierced him. Cross lurched forward, body automatically trying to get away from the intrusion.
His father made a disappointed noise. “Relax, Sans. This is your reward,” he said. The fingers never stopped their assault, stretching Cross open wide as they searched.
Despite his practice, Cross couldn't help but let a small whimper escape him as those fingers brushed against that spot inside him that made him see stars. He could practically hear the grin on XGaster's skull.
“There it is. Don't worry about being quiet this time, you deserve it,” although he tried to sound reassuring, XGaster's tone was flat. Still, his fingers targeted his son's prostate with a vengeance, diving into the sensitive patch of false flesh.
Cross tasted blood as he bit down hard on his summoned tongue. He didn't want to moan, memories of times he made noise flooded his mind. His ass and throat ached at the thought. A smaller part of him, one Cross refused to acknowledge, simply wanted to disobey in any way he could, just to spite his father. As if he could read Cross's thoughts, XGaster summoned another hand, stroking his son's cock in time with each thrust of his fingers.
“Ah! Mmnnfah~” Cross couldn't help but moan, each one torn from between his teeth. For better and for worse, XGaster knew his body well, and quickly drove Cross to his orgasm.
XGaster crooked his fingers harshly and twisted his hand on the next downstroke. His hold on Cross's spine tightened as the smaller skeleton spasmed as he came.
A fourth hand caressed the mounds of Cross's ass, lingering there even as he came down from his high. “Congratulations, my son,” XGaster said, “But now that you are a Guard, your training cannot lapse. Your next course begins now.”
Cross's breath hitched, but he nodded. He would be the perfect soldier that his father molded him to be.