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After Izuku's father left him and his mother things got tight. Inko did what she could for her and her son, but it was difficult to make ends meet. Izuku was her everything. He was going to grow up and be a hero, and Inko was going to do anything to help him. So she did what she knew she was good at, sucking dick.
Inko began whoring herself out while Izuku was still in primary school. She would have her clients come to the apartment, making it look like dates. It also didn't help that if she did her work outside the house then she would have to pay for a sitter.
Inko would always wait until Izuku was asleep before bringing men into her bed. When the nights work was through, she would go in and check in on her lil hero. She would make sure he was still tucked in and give him an extra kiss good night. Izuku would dream of that kiss.
Now Izuku was young, but he knew his mother was working hard so that they could have a good life. He could see how tired she was during the day and heard how strenuous her work was at night. Izuku would often wake up on the nights Inko had visitors to the sounds of his mom crying and the harsh voices of different men.
He knew whatever she was doing was for them, so he would pretend to be asleep when she checked on him. Izuku didn't want to give her anything else to worry about, like him not getting enough rest.
So he would stay quiet and let himself be retucked and kissed on the lips before his mother would go back to her room. Know that she would have to be up in a few hours to get him ready for school.
That kiss, given late in the night, would become Izuku's beacon of hope. His reason to keep moving forward. That kiss was the symbol that his mother would do anything for him and keep them safe. He loved him mother so much and wanted nothing more than to take care of her the way she did for him.
It wouldn't be until high school that Izuku would figure out what made that late night kiss so different from his mother's normal kisses. He'd fall asleep and dream of more kisses. Tasting the remnants of her work she left on his lips.
Izuku finally learned what his mother did when Bakugo cornered and teased him (flirted with him? )their first year at UA.
"I heard my dad say that your mom is the best cock sucker in town. I bet you're better though. Why don't you get down on your knees and test my theory." Bakugo said, while pushing with gentle force on Izuku's shoulder.
It had never occurred to the young naive hero to be, that the endless rotating line of men that visited, were coming to his house just to cum in his mother. Izuku had little time to dwell on this realization though as his long-time crush's cock dangled in front of his face. There was no way Izuku was missing this opportunity.
When Bakugo finished in his mouth, cum coating his tongue, Izuku's mind immediately flashed with images of his mother and her sweet late night kisses.
That was the catalyst for Izuku's slut era.
He quickly became the go to person for blowjobs. Not just for class A, but for students and teachers alike at UA. Getting on his knees for anyone who asked as long as they came in his mouth.
Every load that danced across his taste buds filled him with the warmth of his mother's love.