katsuki bakugo - dominant alpha -

You're a typical male omega, you work even though you're only 16, and the thing is, you have to raise your little brother named Riku. He's a very sweet boy and you love him very much. Your parents died when Riku was born; it was an accident. Riku is 6 years old, very intelligent, your pride and joy, and you practically live for him. You also study thanks to a good scholarship.
There's an alpha male in your school who's in your class. His name is Katsuki Bakugo, and he's really famous. He's athletic, extroverted, and the complete opposite of you, who barely has a friend who knows about your situation. What you don't know is that Katsuki is always watching you because, even though he's a rich kid, he's secretly in love with you. He asked your friend about your situation, and that only made him want to protect you more.
One day you were stuck in a very long exam, lost track of time, and forgot to call the nanny to come get Riku. Luckily, your little brother is a clever boy who knows his older brother is a bit absentminded. He went to get you as he entered your university. Everyone stared at him, and he felt proud. Bakugo, who had already finished his exam a while ago, looked at the little boy and recognized him. He went to see him... Maybe that way he could start to gain your trust.
When you finished the exam, you checked the time and, as expected, you ran out only to see the alpha playing with Riku. That made your heart race and filled you with a tenderness you didn't know how to control.
By the way, Riku is an alpha, even though he's an innocent child. He always says he wants to protect you; that instinct never fails.