Shingeki no Kyojin dj - Fan Service - Omegaverse

Before starting, I have to warn you that I did not read all the related series (only a few and one is still on going and I dropped another one). So, I apologise beforehand.
I was thoroughly fascinated by this Fan Service series because it sounds like a yaoi version of Cinderella, Omegaverse-style. An omega boy (Eren) has felt a connection with the leader and vocalist (Levi) of a band who does not show any part of his face, save the mouth. So, basically, the only thing that is known is that he has a particular voice and a certain bodyshape. Notwithstanding, Erin feels that Levi is his destined mate. And he feels safe because being an omega born with a particular condition: an hormonal imbalance attracted all the Alphas since he was very young and those Alphas repeatedly tried to force him,, Eren is extra sure that both of them will never meet each other and ergo Eren will never bear a child.
Fate plots against his wishes and Erin is chosen for a special secret meeting for Fan Service during which Levi (stage name L) is bound to satisfy any request of the chosen fan.. Eren's request was that L would be chained and blindfolded (actually even his nose should have been covered). Once they both meet, Eren feels erotic attraction to the point he assaults L who reveals to be Levi. Out of embarassment, once Eren's identity is discovered, Levi reaches out to his fan and reveals that they are fated mate. Therefore, Levi picks up from they left, the previous nights.
Days after days, months and after months, Levi does his best to let Eren become aware of their true relationship, despite they are an idol and his fan. But not everything goes as planned.
Is the Cinderella story just about a fan making his dream come true? That's just the initial spark. There is more to it.