Call it anything!

You ran into my heart like it was a mighty haven,
Gripped my tricuspid valve like it was a weapon,
Then you wrapped yourself in my pericardium
Like its Harry Potter's cloak.
Your blood mixes with mine like osmosis is occurring
And now my heart pumps not only my blood..... But yours too.

Your grip should have disrupted my blood flow,
Rather it became 100% efficient.

Wawu!!

I think its best for the both of us if you continue your stay.