Spoilers!
Read at the risk of spoiling yourself.
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Siphyr's or more specifically a curse that his father passed down to him.
It was all up to fate whether who in their family will get this curse.
So what exactly is this curse?
It's called "Sparks of Fate"
As the name suggests it is something related to fate.
To be exact it is a curse that will help you find your fated one.
Once you meet someone of the opposite gender that you are fated with, a tingling sensation will be felt by the two of you as if you are about to pee.
Then, she will be shown memories of the future, specifically memories of the two of you together.
However, whether she believes this or not or comes to love you because of this will be up to her.
There will be times that someone wouldn't believe what they see but according to his father, without even doing anything to progress the relationship they still end up together.
It was fate, and showing her the future of you together is just speeding up the process of your love.
That's why his father advised him,
"If you're fated with her, make her yours."
After this, the one you are fated with will have a tattoo engraved on their back if they accept you as their spouse.
It is a tattoo that has a serpent coiling around a red rose.
This tattoo will also appear to the ones who accepts your love without the curse.