You and Alastor were both experimented...Alastor was a demon while you were still in the process of your form....which might take a while.

You were a bit weak since your form was still processing and growing inside you, so in the meantime, Alastor was your protector

A few scientists walked in, and Alastor growled at them as a sign to back off.

The scientists then pulled out a syringe and injected you with black liquid

The injection was quite painful, which caused you to cry