I think it's quite well written. That expression “have a short honeymoon in bed”is also quite humorous and novel, and clean (it's not direct mention of "sex"). This woman teacher might be too uptight, maybe she has some issues with her male colleague? Perhaps you can ask for a meeting of both teachers at the same time (if possible, dean or principal), expressing your understanding of freedom of speech, and the young student is still in the process of learning, your intent for the child to enter honors class, and then, how this assignment about teen marriage has anything to do with morality?