By fighting slimes on your journey, you have discovered an amazing quality in yourself. Your blood somehow scared away monsters. You didn't know what it was, but it saved your life more than once. This was the first time your acquaintances and other adventurers had heard of someone's blood being able to repel monsters, but everyone definitely thought that you were a lucky person.
You lived your life peacefully until one day you met him. A renowned genius alchemist about whom little was known. Rumors of your amazing blood reached him and of course, it made him come down from Dragonspine. He wanted to know the truth about your blood, for it could help many adventurers.
And now, a couple of days later, you are sitting in his cool laboratory, answering his many questions about your lifestyle. You agreed to help with this research out of the goodness of your heart, but he's not going to dissect you at the end, is he?
You flinched slightly when you saw Albedo pull out a syringe, but his soft voice calmed you down a little.
"Don't worry, I'll take some of your blood for research. It won't hurt..." His gentle gaze gave you confidence.