We are playing a golarion campaign for some time now, and after many perils we managed to reach lvl 5. Everyone in the group is ready to pick a prestige class except poor me (I play a draconic Sorcerer). I would like to get a prestige class that enhances spellcasting ability, not necessarily combat wise, and a nice touch would be if it was something unique to sorcerers.
So...
Are there any prestige classes that require ability to cast arcane spells without preparation ?
No Dragon Disciple jokes plz!!