Somnum Confluere (слэш)

Severus Snape’s body survives the war.
His mind does not... As coma and neurological collapse threaten to claim him, Harry Potter agrees to attempt a forbidden, largely theoretical spell: Somnum Confluere—the joining of dreams.
Inside Severus’ fractured inner world, Harry confronts memories of childhood cruelty, betrayal, and self-erasure, while the waking world threatens to take them both.