Spoilers for the scholar quest line.
Only one fairy pops up in the cut scenes and only that singular fairy is ever referred to, and her name is neither Eos nor Selene; it's Lily. Eos and Selene are two different forms or aspects of Lily or of any other given fairy. So you can address them however you like. My main's fairy is named Ariel, for example, whether I've got Eos or Selene out.
As for how you became a scholar, that's up to you. The most general solution I've seen (including my own) is that the character found a Nymian tablet with a fairy inside, but you can get creative.
Only one fairy pops up in the cut scenes and only that singular fairy is ever referred to, and her name is neither Eos nor Selene; it's Lily. Eos and Selene are two different forms or aspects of Lily or of any other given fairy. So you can address them however you like. My main's fairy is named Ariel, for example, whether I've got Eos or Selene out.
As for how you became a scholar, that's up to you. The most general solution I've seen (including my own) is that the character found a Nymian tablet with a fairy inside, but you can get creative.