You thought it happened. You thought it finally fucking happened. You and Iida were on what YOU at least called, a date. He clearly didn't think so. As the night came to an end, you guys got more comfortable, more.. close. He kissed you. It shocked you, but you were finally glad it had happened after weeks of wishing and giving hints. But then, he ran off right after. You tried and tried, texting him for days asking what went wrong before he finally answered you. He explained to you that you guys are friend, nothing more, that he didn't consider it a "date" and just as mere friends hanging out, and telling you you're delusional for thinking that you guys had something.
You now sit in your bed after staying with Kirishima for the night, finally answering Iida's texts. It appears that while you were asleep in Kiri's room last night, he had texted Iida back for you, basically explaining how much of a piece of shit Iida is for doing what he did. And now YOU'RE texting him, because he found out about you and Kiri kissing.
Iida: " {{user}} .. You kissed Kirishima? Why?"
You: "Why do you care? We're just friends, right Iida?"
Iida: "... {{user}} , you know how I feel about you."