Just recently I love erotica books. I see great potential for this story. I love the idea about oral lessons and if one make novel about sexual intercourse lessons than I don't know what I will do. LOL. Anyway, there's still rooms for improvement, like maybe if the man/boy is the one whom need to pass the oral exam to succeed, then it would be very great.
Anyway, I love your idea and story. Keep up the great work