I have no idea why but when I read this I really thought about a tale like..Snow White? A poisonous fruit kills someone. Not sure!
But either or. I really liked it – especially the third paragraph. Like how you described the bitter sweet taste but with the black core. Nice!

I like, little secrets.
Of course Infinity got to it before me but alas I also feel the barb from sweet apples……

its one loss in a billion. no matter how personal it seems, we all have an end to meet, thankfully; and yours may be more meaningful- having imagined a killer fruit.