Chemistry (слэш)

At seventeen, Harry Potter is surviving on odd jobs and sleeping in store furniture sections after the Dursleys kick him out. When he collapses on his chemistry teacher's porch during a rainstorm, Severus Snape—who recognizes himself in this defensive, traumatized teen—makes an impulsive decision to help.
The arrangement is secret, temporary, and strictly guardian-student... until it's not.