The canon ending for me is season 2 of the anime when Ciel became a demon and Sebastian was like "oh no I guess we're stuck with each other forever now nothing we can do"
You can also interpret Sebastian punching Ciel in the chest as trying to save him from the curse of immortality or maybe even trying to speed up him becoming a demon because that's his little wife.
Also love how they take the time to say goodbye to everyone and then ride off into the sunset together, that's the most romantic shit.
sebastian is like that dog who pretends he doesn't care about the ball, but his tail gives him away.
ciel tells him that from now on he will remain his servant forever, and sebastian is just like, "i guess i will ^^"
i also like thinking about that scene as sebastian making sure ciel really is becoming a demonβnot in the sense of "maybe i can still avoid my fate" but rather "this way i can be certain i won't lose you." after all, he only does it once ciel opens his red eyes. it's such a small detail, but the fact that sebastian waits for that moment has always stayed with me as proof that he wanted ciel to awaken as a demon.
literally that scene is so romantic that it's one of my top sbcl moments. the moment ciel became a demon, he stopped caring about everything else. he no longer had to live up to other people's expectations. it doesn't matter where they end upβthe one certainty in ciel's life is that sebastian will be by his side.
gif by mistyblue thanks as always!!
