Tweedle dum n Tweedle dee. Jill's challenge

Tweedle dum & Tweedle Dee,
Odious & grotesque,
Emulate melancholy,
Glutenous horrid mess.

Blackened heart, null of bias,
Hand in hand together,
Riddled, mirrored, macabre,
Joined at the hip forever.

What I do, so does he,
Like puppets on a string,
Orchestrated savagery,
Beneath a demons wing.

No happy ever after here,
Just two dispicable twins,
Snared by a fallen fiend in fear,
Our hellish tale begins.