The final deal
Quinn knew that it was important to keep what Erin was a secret, due to it being one of the 'Kill on sight subclasses.' Similar to the blood fairy. However, Quinn thought it made sense since their blood was deadly, and even he and his group were able to benefit from the use of the fairy blood.
As for Erin being a Dhampir, there hadn't been any stand out signs why they were treated in a similar way.
"Say whatever you want, but no matter what, I'm not getting rid of Erin." Quinn said. "She has done nothing wrong."
"I understand that, but you should at least know the time bomb that you are holding onto." Eno replied. "You being a human turned vampire, you will probably understand this more from your perspective. The urge a vampire gets when they smell human blood for the first time. The first time a vampire gets a taste for the blood.
"It's something so powerful that one loses their mind, not knowing what they have done."