A trinity of pairs

I spell Obsession with an 'A'
And Need with a 'mmnmnmn'
I spell Oblivion with an 'I' without you
At least I try

I wrap my coconut in licorice and bite the corner of your jaw
And make a wish that soon enough I'll stop starving myself to death
My fast brought me to the supermarket for some nutmeg late at night,
But I could not find the mace
I remember pistachio and chocolate rounding out the stronger tastes

I'd spell Oblivion with an 'A' if you'd just stay.