For them, this is something of a regular occurrence.
Lost together in a haze of lust, just barely cognizant of the world around them while tangled with each other's body.
But something today was... different.
The room was dark, but it all felt so bright.
Asriel's scent was usually comforting, but right now addictive and overpowering.
Kris couldn't keep his hands away. He couldn't be close enough. He pulled his brother into a kiss.
A simple action like this was enough to push Asriel into climax.
The first shot. Warmth filling Kris' insides that only amplified the sex-driven daze over his mind.
His cock leaked onto the sheets below as he approached his own limit.
The second shot. Kris pulled Asriel deeper as he rode out the orgasm.
Then the third. An incredibly strong contraction wracked Kris' lower abdomen.
All at once, he snapped back to reality as his muscles spasmed, his cries of shock being lost in his brother's muzzle as his body tightened around the rod inside him.
As far as Asriel could tell, Kris was milking him for all he was worth, and he would meet any challenge for his favorite boy.
He thrust in once more, filling Kris up and unloading each shot as deep into him as he could, entirely unaware of Kris' predicament.
The sensation was alien and intense, with no rhyme or rhythm, and continued on for at least a minute; A fair while after Asriel was finished.
Asriel broke their kiss, only to place his lips against Kris' neck and murmur something about cleaning the sheets tomorrow, and then a good night.
Kris absentmindedly murmured it back while trying to make sense of what had just occurred.
Furry hands wrapped around Kris' chest and pulled him close, while his own hands reached for his stomach and felt it gently.
Eventually, Kris tried to push it out of his mind, and fell asleep in the arms he loved so much.
Asriel woke him up that next morning with his usual smile. Ordinarily, Kris was happy to be woken up, but right now he felt... dizzy.
Not ill, rather that his center of balance was completely off. He tried to stand up and stumbled into Asriel, who caught him and held him upright.
There was a sense of warmth within his core that was entirely unnatural to him.
Asriel looked down at his brother in concern, trying to gauge the issue as best as he could.
Kris gazed down at his stomach, squeezing Asriel tight. Asriel sat him back down on the bed and knelt in front of him to look into his eyes.
Fear and uncertainty were plain on Kris face.
"What's the matter?" he asked in a rushed tone, driven by concern.
"I--" Kris couldn't find the words just yet. He still didn't even know what was wrong. All he had was an impossible thought. An insane, undeniably impossible thought. And yet...
"Asriel... What would happen if I..." he struggled to speak this at all, for how absurd it all sounded.
"What if I was..." he placed a hand on his stomach, "... pregnant...?" The final word came out lilted, like he was confused to even be saying it, and his cheeks flushed red.
Asriel had to process the question for a moment before stifling a laugh and pulling him into an embrace.
"Oh man, was it really that good? That's the best compliment you've ever given me."
Kris remained silent, not having anything to say. A part of him knew how absurd the situation must sound, but another part of him desperately wanted Asriel to take this seriously.
When Kris didn't laugh alongside him, Asriel let go and looked down at him once again.
"Well... uh. That's not possible, y'know? We're both guys. You know that, haha." Asriel pat Kris on the head, slowly bringing his hand down to his cheek and stroking it gently with his thumb.
"But... If that did happen, I guess we'd have kids. Although Mom would definitely kill me."
Kris placed his own hand over Asriel's and took a breath.
Right, of course. Kris couldn't possibly be pregnant. That's not possible. What happened was just an odd occurrence.
Kris pushed himself to his feet, forcing himself to find his balance once again.
It's not possible. This heat deep inside of him... definitely doesn't mean anything.