Maybe Morgan might look older than 16 with his hard, muscled body, but he needs to be careful to not sound younger or not as aware of his past high school education. Troy is immersed in his high school education and may make references that Morgan will miss or seem out of his depth
Morgan may be as sexually inexperienced as Troy so Morgan needs to talk carefully and not give away any clues about his younger age or past experiences. They will both be highly horny and may begin to be more physical in private within limits that might expand over time. But, Troy being 16 makes him legally underage