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![](https://pic1.mangapicgallery.com/r/avatar/a3/u5787_50x50.jpg?2)
In the Castle manga the egg was fertilized too, but it never hatched for a VERY long time something like a 1,000 years or more(?), at less not until it got "magic cum" on it from the sex-ed teacher, then it hatched. That's what this was all about, saying it needed the magic cum in order for it to hatch, since this egg hasn't in a long time too. At least that's what I got from Myezer post.
Cum on the egg he need to cum on the egg or speack to the egg
MAGIC CUM(〜 ̄△ ̄)〜 magic cum(〜 ̄△ ̄)〜