Where You Should Not

You grow in me
where you should not,
a tumor,
a parasite that swims
and breathes blood.
You take root
and dig in,
fingernail-worm-thing,
latching on,
and would bleed me dry
if I let you.

I will not let you.

No one
can make me.

If it is you
versus me
I will win.

Furthermore,

I will not regret it.