Tohru and Fafnir are best friends, like the relationship Kobayashi and Takiya have.They meet up sometimes when both Takiya and Kobayashi are working and Kanna is at school, to discuss human behaviour and just general small talk.
Tohru likes to give Fafnir relationship advice for him and Takiya, to which he always replies with how he’s not interested in that way. One day Fafnir comes to Kobayshi’s apartment to find Tohru, his face red and general behaviour completely off. Tohru offers him tea and biscuits, which he gladly accepts, before ranting to Tohru about how ‘humans are stupid and I can’t believe he didn’t pick up on my hints and subtle flirting and so I just full on kissed him and then he left oh no I fucked up what do I do’
Meanwhile Tohru sits there sipping her tea with a smug expression.