Tsubaki gaining a crush on Mahiru coming in with a steel chair!
this is genuinely the worst thing to have ever happened to him as a vampire (because let's be real we all know what actually IS the worst thing to have ever happened to him if we add his lifetime as a human)
to fall in love with mahiru is to be fucked up in a certain kind of way that makes being near mahiru a soothing experience, and tsubaki is THAT kind of fucked up
the kind where he uses his own name as a gravestone for a dearly departed he doesn't want to let go, except being with mahiru means he will slowly but certainly learn how to move on
the gravestone will stay, but tsubaki will no longer spend all his time clinging to it in a vain attempt to protect it. instead he will learn how to properly take care of the gravestone so the name etched onto it won't fade away.