Wrathion and Anduin have some interesting interactions in the beginning of their adventure, mostly due to Anduin’s fractured psyche and Wrathion’s pride/arrogance.
Anduinn can be timid one moment, then turn cold and detached the next, and suddenly can become a raging death machine without even a flinch. However, being around Wrathion and being forced to interact with another person peacefully does start to bring back some of his old personality traits.
After this moment however, Wrathion learns real quick that Anduin does NOT like being touched so suddenly, especially when Anduin tries to tear out his soul in retaliation.