Before anyone says they don't have lunch boxes and eat at the cafeteria, just think the cafeteria is closed for a reason and they had to take lunch boxes.

Izuku Midoriya:

At first he thought it was a note from his mother, but then he recognized the handwriting and his face went bright red. He read it over and over, mentally freaking out. He spend the whole lunch time reading it, forgetting to eat his food.

Katsuki Bakugo:

He felt his face heat a little as he grumbled something under his breath. When Kirishima looked over his shoulder, asking what it says, Bakugo was quick to elbow him in the face and yell to mind his own business before crumbling the note and throwing it in his backpack.

Shoto Todoroki:

He stared at it before a little smile formed on his face. He neatly folded it and put it in his pocket before he ate the food. Later, he put it in his desk drawer to keep it safe.

Ochaco Uraraka:

She gasped before her face turned bright red, shyly whispering this is so sweet. When Mina leaned over her shoulder and asked what it says, Ochaco blushed even more as she stuttered out what it says. When Mina said you are such a good lover, Ochaco was quick to nod many times in agreement, hurriedly pulling out her phone, saying she must immediately thank you for this.

Tenya Iida:

He blushed, shocked and flustered by this sudden affectionate note before he cleared his throat and put it in his pocket. When he saw you in person, he cleared his throat before thanking you for the note and how he appreciated it.

Eijiro Kirishima:

He gasped before he took it, reading it over and over before he held it to Bakugo, excitedly saying his lover left him a note. When Bakugo told him to get it out his face and tried to snatch the note, Eijiro yelped before he held it far away from Bakugo, telling him he can't destroy it because it's special.

Tsuyu Asui:

She let out a confused "ribbit" as she pulled it out, confused as to what this is before she smiled when she read what was on it. She pulled out her phone so she could text you that you are so cute and the note was very nice of you and she appreciated it.

Momo Yaoyorozu:

She made a little confused note when she saw the note, wondering why there is a note in her lunch box before she took it and read it. She got a shy smile, biting the inside of her lips to try and hide the big smile growing on her face before she neatly put it away. When she saw you, she blushed, thanking you with a stutter for the note and telling you that she appreciated it a lot.

Denki Kaminari:

He stared in amazement at it before he hurriedly pat Mineta's shoulder, stuttering out that he has gotten a special note from you. When Mineta said that's such an amazing thing and he's lucky, Denki nod many times before he happily held the note up, proudly saying he has got the best lover.

Kyoka Jiro:

She tensed up, her face turned a little red as she facepalmed, embarrassed. She pulled it out and read it a few times, getting more shy and embarrassed each time she read it before she awkwardly put it away, hoping no one saw that.

Fumikage Tokoyami:

He stared at it, only to flinch and blush when Dark Shadow popped out and began teasing him. Fumikage flailed his arm at Dark Shadow to chase the shadow away while hurriedly stuffing the note away with his other hand. When he saw you, he felt his face heat up as he muttered a thank you.

Mina Ashido:

She got excited, showing it to her friends, telling them to look at how cute her lover is before she said she needs a paper and pen so she can also write you a note. So it kind of became a thing you two do. You leave her a note, she will leave you a note.

Yuga Aoyama:

He gasped before he pulled it out, reading it over and over before he proudly held it to some of his classmates, telling them to look at what his wonderful lover has done for their amazing boyfriend. When the classmates awkwardly nod, he put it safely away, very happy and proud now.

Eri:

She stared in amazement before she pulled it out, happily kicking her feet as she read it. She hung it above her bed so before she goes to sleep, she can read it and go to sleep with this warm, happy feeling.