This has my general headcanons on how most monsters reproduce and (to a lesser degree) rear children. This one's skeleton specific, but most of what's featured here is also shared by some monsters (i.e., bird monsters).
Also how the fuck do you write an AU you barely know and can't look up once you find out who the creator of it is.
Sorry for any misinformation.
OH! Another thing, this is kind of a full-fledged version of a one-shot on here I may or may not finish and/or post. Both will be standalones though can be read together... kinda.
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If Dream ever has another kid, he's having Error carry the responsibility of dealing with the pregnancy.
Unknown to the public eye, Dream and Error are... uh... secret lovers. Being an owner of a very famous and powerful organization, Dream often has some close calls. They sadly couldn't put it out there that they were both dating, since Dream originally created the Justice Reigns in hopes of saving AUs and... killing Error and company.
You can figure out how it would complicate things.
At first, they loathed each other. Upon accidentally meeting each other, Error would growl, Dream'd fluff up his wings and snarled and spit insults, Error would get angry and they'd eventually desolve to attacking each other. Then one day, Dream just wondered what would happen if Error and his friends died.
After that his hatred for Error kind of nuffled.
Dream started to tell guards that Error was in this AU when he was really in another and that Error was seen creeping around the perimeter just so he could slip into other AUs without notice or being caught. It was strange and while usually Error would take advantage of that, it seemed like he was confused too.
Soon enough Error was caught and forcefully thrown and locked in the bottom floor. Despite Error's imprisonment, he didn't seem all that nasty about it. After Dream told all the guards that he would be *ahem* interrogating him and to leave him alone with Error, they actually had a nice chat.
They became friends.
They became lovers.
As of today, all of the people in the Justice Reigns currently think that Error's "laying low". Dream didn't say yay or nay to them but they made up their own conclusions so he didn't bother to correct them.
The castle was silent and the night was cool; In Dream's opinion, it was the perfect opportunity for a passionate night, and Error sure seemed to think so too. At the very back part of the castle, Error was in Dream's room- his bedroom- and one thing led to another.
Interpretate it how you'd like.
The room was cool, which was fine by the two. Error was preening Dream's wings and Dream was cuddling Error to a degree, his head on Error's shoulder, and wings opened and relaxed. The sheets were probably stained but they didn't care. The passionate duo were still reeling from the previous euphoria, pleasure and ecstasy. It was nice, relaxing.
Dream lightly purred at Error petting his skull. He loved all the preening, all the touch, all the love... the warm, sticky feeling inside him... the hot breaths of air...
Before Dream knew it, he was asleep.
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Dream woke up to hear birds tweeting their heads off and bees buzzing loudly. The blankets were gently tucked around him and he pushed them away.
A note was left on the bedside table. The calligraphy was a little difficult to make out but not impossible.
"Hey, some guards knocked on the first door-"