Disclaimer: I do not own My Hero Academia or Superman, all rights go to their respective owners.
After being cleaned up Izuku went right back to sleep, most likely tired from the trip from Krypton coupled with the fact he was currently a baby, as Inko stared at the cute baby in her arms, she realized she was the happiest she has been since before Hisashi's death, she decided right there and then to love him like her own son, she wasn't too worried about the part of him having powers as in this day and age 80% of the population had such superpower's called "Quirks" unique powers inherited from your parents, a combination of them, or a completely new power, she could always disguise his powers as a quirk if it isn't one already. The real problem was how she would explain finding a child in the middle of a farmland without revealing that he's an alien, this put her in a dilemma because revealing the fact he was an alien would probably cause him to be experimented on and hunted, which she couldn't bare to see, but on the other hand, passing him off as her son would probably have negative consequences when he finds out she wasn't really his mother in the future, which would break both of their hearts as he might be angry at her for lying to him for all those years, she ended up deciding to bite the bullet and hide the space pod underground at her parents farm, she would show him the hologram and everything about the ship when he became older, but for now he could be her little baby Izuku. Izuku started waking up because of Inko's muttering, he then starting making baby noises mimicking Inko's muttering "Oh my god, Izuku you're so cute, you're trying to be just like mommy! just please don't copy this habit it's an annoying one and I don't want you picking it up" Izuku started giggling and mimicking Inko's muttering again until she gave up and decided "I don't mind anymore you're my son now and won't stop loving you no matter what, I'll do my best to always be there for you where your real parents cant, i'll make sure you grow up to be a young man they would be proud of, someone who protects the ones who cannot defend themselves, oh how much I wish I could just keep you at home forever but even I can tell that your destiny is too great to do that." "I'm probably going to have to tell my parents about you and convince them to help me fake a story of me giving birth to your here with my parents for comfort, with all of the questions I received about my sudden weight gain it probably isn't going to be too hard, i'm just going to have to stop stress eating and lose some weight." Inko then called her parents and convinced them to bring a truck to carry the space pod to their farm with a cover on top of it so it isn't seen and looks like a normal truck in the countryside. She then explained what happened and her decision to take Izuku as her child, her mother agreed completely stating "He is so cute, we are not putting him in an orphanage we have to take care of him" while her father was wary of adopting an alien child he too fell to Izuku's cuteness the second he started giggling and chose to treat him as his grandson. After hours of getting their story straight, they had gotten enough information and planted enough proof around the house that Izuku was Inko's child, Inko even took Izuku to a trip to the hospital to get Izuku's birth certificates. Needles did not work on Izuku which was treated as a quirk and largely ignored making Inko nearly cheer in jubilation, which would have blown her cover as many parents would be more worried about their children developing quirks this easy as they wouldn't be able to control them as babies, this means that they could somehow develop their quirk further unexpectedly which would get them hurt, for example Inko's low level telekinesis quirk attracts small objects to her, if she had developed and used this quirk as a baby she would have attracted small objects hurting herself, especially if she ended up attracting a small but dangerous object like a knife to herself. After getting Izuku's birth certificate, ID and other paperwork completed she had finally 'adopted' Izuku, he was officially her son and it would be difficult to prove otherwise as his quirk has manifested, which usually shows changes in a child's DNA making them unreliable.
Should I add this novel to Fanfiction.net as well? I hope you like the explanation about the dangers of developing quirks early, I felt like adding that detail about quirks being dangerous would be helpful in understanding Quirks which usually manifest at 4 years old for these reasons. Inko is of course worried as she loves Izuku but due to his 'quirk' giving him tougher skin and the happiness she felt at DNA tests being harder to perform she could more easily fake the fact Izuku is her son.