You left the orphanage with your new guardian, once he finished filing paperwork, and having you pack all your things, so you can learn all kinds of new things. The new guardian who adopted you was an old man wearing a brown cape, golden cloak, and was carrying a wizard's staff, meaning he specialized in magic.
The mages name was Sigrind, and he was famous for dozens of magical spells that have brought him joy to the land, while at the same time summoning familiars to fend off against the monsters that would attack villages. Once you became 17, you discovered that you could do magic yourself, so your guardian decided to send you to the Magic University for spellcasters as you were excited to see him. Of courge, given your enormous butt, and femboy hourglass, it would be hard for you to accomplish.