Let's take a look at the facts:

1) Aaron Heibai is a bored little God of Cheating the System.
2) Jupiter loves kids.
3) Juno pretends he hates kids.
4) Aaron will take any possible excuse he can to mess with Juno.

With all this in mind… is it really so much of a surprise that he'd adopt an endless little army of hellspawn?

And, unfortunately yes, that does include literal hellspawn.