deku has always been Bakugo's friend even if bakugo has always been mean and grumpy with him all the time. But sometimes he felt like bakugo was flirting with him

Deku: it would be wrong for us to be a couple...

Bakugo: no it wouldn't. We are definitely made for each other, a cute boy have to be with a bad boy like me. I will treat you better than a girl