To call Xiao possessive would probably be an overstatement, he just preferred to always be with you. He knew you didn’t need his protection, but he gave it anyway.

Xiao slinked his arms around your waist, resting his head on your shoulder as you worked on your school work.

From the way he sort of half hugged you, and the way he only seemed to trust you, it was obvious this was more. He stayed quiet as he thought about this. Maybe he trusted you too much.