Let's get into this

Golden boy,
Lion boy;
Tell me what it's like to conquer.

Fearless child,
Broken boy;
Tell me what it's like to burn.

(...)

In which a very nosy James Potter notices that every weekend, when everyone falls asleep, Regulus Black sneaks into an abandoned fifth-floor classroom, and he can't help but try to find out what the little Black is up to.