Again, although Nic claims to be fine, it’s an enormous red flag that he has a mysterious ulcer at the age of 17. Readers can infer that this ailment is likely the result of Nic drinking heavily while he was in Paris. This early indication of Nic’s substance abuse problem illustrates just how quickly he is succumbing to addiction. It also highlights David’s lack of control over Nic, in being both unable to prevent Nic from damaging his body and unable to even discern exactly what he is doing to himself.