The Red Dragon of Babysitting?

Azazel had decided to cash in the favor that Rias had owed him. Said favor allowed him to test his newest invention on her and her peerage, which was supposed to make them look younger than they are. So how in the hell did it result in a clubroom filled with overpowered and over-energetic toddlers? No pairing as of right now. May contain OOC elements. !Babysitter Issei