Introduction: After the war, Professor Snape did not die under the fangs of Nagini. Harry was hunted by the wizarding world because he once had Voldemort's soul fragment in his body. Professor Snape saved Harry on the way to escape and fled with Harry. Finally, in order to save Harry, he died in Harry's arms. Harry held Professor Snape and ended up under the green light.
Under the background of rebirth in fifth grade
Professor Snape
(Any discrepancies are purely coincidental)
Purpose: Companionship and love