Whether you like it or not your snake is just a common, normal pastel.
Just like every other pastel on the planet is just a common, normal pastel unless it is bred with something else and carries more than one gene.
A true Lemon Pastel is just a common, normal pastel that happens to have been selectively bred to show a little more yellow.
A Grazani Pastel is just a common, normal pastel.
Even the famous Winston, owned by Robin here, while a stunning snake is still just a common, normal pastel.
There are different "grades" of pastel according to many people.
A Low grade pastel is a snake that has lost it's bright yellow coloration and is now almost indistinguishable from a normal.
A mid grade pastel has some yellow coloration into adulthood, or is at least noticablely lighter than a normal.
A high grade pastel had a lot of yellow coloring and fading that lasts it's whole life, you'd never mistake it for anything but a pastel.
I would rate yours as an upper mid grade pastel, a very nice animal with a lot of color. Bred to the right females, he has an excellent chance of improving the colors of his offspring.
But as far as insisting he's anything but a very nice pastel, that is pointless. Far too many people now give the title Lemon to any pastel that is bright as a baby. So unless you have proof that this animal came from NERD, it's not a lemon. Same thing for any of the other "named pastels" if you can't prove it came from that breeder, it's just an exceptional pastel.
By the way, if not having a title upsets you that bad, I'd be happy to take him off your hands for what you gave for him.
Gale