It is not absolutly written in stone.
Patterns can change.
Yes, you can ask an unnamed, unknown love person into your life. To ask for a specific guy or girl would be to manipulate their free will and would cause you to become manipulated 3times over. The end result is never true love, but lust and obsession. Although, Lust spells, If what you truly want is to fuck like Gods are quite effective. It is not absolutly written in stone.