The injectors

Keys
But hearts don't have locks, she said.
Some do, he replied. There are people who give away the key to theirs for safekeeping. Others are mistrustful and give out several keys just in case.
then there are those who have misplaced them but never cared to look.
What about your heart, she asked.
He smiled.
Your words are the key to mine, he replied.
never forget your words.
- Lang Leav