Basically Takiya does something that is normally considered a dragon courting ritual like giving Fafnir shiny new rock he found on the riverbank or something that made him think of Fafnir then Fafnir's all confused and shit because is Takiya trying to fucking court him? And it doesn't even occur to him that Takiya probably doesn't know any dragon courting rituals
So Fafnir goes to Toro about this because she's been among humans the longest to which she tells him that Takiya probably didn't know what he was doing and that he probably didn't mean it
Que Fafnir being all sad and broody because his crush doesn't probably like him back (He definitely does) Takiya notice is this and then instead of asking Fafnir because he knows him He goes to Kobayashi who overheard Fafnir and taro's conversation and relays this all back to Takiya who understands this and feels stupid for his idiocy then goes to clarify to Fafnir that Yes he does like him but no he did not know that was according ritual... Happily ever after some shit I'm not a fanfic writer although I'd like to be