Gianna earns an A by servicing Prof White's shaft.
Professor White offers Gianna some extra credit when he finds out that she's doing sex work to pay for college. She's failing his class, but she can turn that F into an A back at his hotel room. The way she services his cock shows that schoolwork isn't her true talent. Gianna drains his balls all over her face and tits, not wasting a drop.
