The parasite.

The parasite latches on and grows,
Slowly digging into the core,
Taking, giving and changing,
until you recognise yourself, not.

You love the symbiosis,
the mutual feeding off.
Can't imagine life without,
Until you recognise them, not.

Remind you, I must,
A parasite is just a parasite,
Takes more than it gives,
Destroys more than nurtures.

It will end one day, when,
Anymore you can't give.
Empty and devoid, you shall be,
Exhausted and alone.

A parasites need a core to live,
Yours or somebody else's.
Special you aren't,
Just another empty core.