ok so I can imagine that Deku is standing on the edge of a 20 story building getting ready to jump but before he does he calls Bakugou up to the top with him. when Bakugou gets there he goes over to Deku and asks what he wanted but all deku says is "I'm doing what you asked" then he proceeds to jump. Bakugou then jumps after him and grabs Dekus arm and throws him back to the roof top while yelling "I'm so sorry for everything just promise to become a hero and better person than me." Then falls to his death, leaving Deku at the top to mourn his best friends death. He forgives Bakugou and promises to become the hero Bakugou wanted him to be. He trained extremely hard and made it into UA hero course without a quirk. Years later he became the first quirkless #1 hero. His hero name was "Deku" in remembrance of Bakugou. He made sure to visit his grave no matter how busy he was and thanked him for everything he did for him.