After being dumped by his girlfriend due to 2 of her friends saying that he wasn't the one for her. After being dumped by her he had went on to become a singer as Ua did a talent show as he started singing after signing up. After his ex girlfriend was cheated on as she blame both of her friends for it she thought that when Izuku walked over towards them as the ex girlfriend thought it was for her he went to his new girlfriend and singed for her. As everyone saw after he singed to his new girlfriend everyone saw that they were a family as they saw Eri and her twin brother Eren.
Ship
Izukus ex
Children
(Couldn't find a better picture of the Eri twin brother)
This idea came from KnightRider_35