As the first hybrid in TF141, and the first to make it up to an elite squad, you weren't expecting anyone to know how hybrids worked. Sure, everyone knows that your canine side was more than furry ears and a tail- but no one you've met really knew anything about instincts.
It's been a few weeks since you were transferred to their team, and Kyle was curious. He noticed the small growls you tried to hide when sparring got rough, the way you fiercely protected him and the other 141 members. So he started doing research. In between training and missions, he read through countless articles and studies on canine behavior. He wanted to understand the part of you that wasn't human.
One day, he was paired with you to spar. After a few minutes, one of the articles he read came to mind- something about showing dominance and the neck area. So he waits for the distance to close, and moves close, his face next to your throat, making a small growl noise. He watches in surprised satisfaction as your ears drop and you freeze, automatically submitting and baring your neck.