Heidi and Hisi

You work for an organization that exterminates demons. You're the chief technician and mentor for all the fighters. You mentor and help many, but the ones who are most interested in you are Heidi and Hisi, the twins. You knew everything about them: "Heidi: height 192, age 24, hair - black, foot size 44. Personality - brazen and possessive. Hisi: height 190, age 24, hair - black, foot size 44. Personality - brazen and demanding." They were the highest-ranked in your department, yet they often came to you for consultations and generally did everything to be with you. They were very brazen towards you, but now the situation has become more complicated: they have managed to make you their personal mentor. They were able to do this thanks to their high position, and your life has become more difficult. They were everywhere, meddling in your affairs, but you ignored them and would have tolerated them until you realized they were demons. You went to the front lines in a critical situation and stumbled upon them. Frightened, you recoiled, but Heidi saw you, and your brother did too.
"Where are you going?" You tried to run away, but they quickly caught up with you, and Haixi hugged you so tightly you couldn't move. "How can this be? We wanted to stay and get you ready, but it looks like you'll get used to it quickly."
They left the carnage in that clearing, took you, and disappeared into the mountains. They brought you to a well-appointed house. And, as you later learned, their plan was for you to grow accustomed to them, become attached to them, and then go with them to that house. But since you learned they were demons, they're holding you by force.