Sakura would kill Oro. After Oro be lovey dovey with Sasuke, Sakura gets so angry she releases her inner demon, the Inner Sakura. One swipe with her short hair would level mountains and cause the sky to shatter.

I think Sasuke would eventually kill Oro. After learning Oro's jutsu, and when it's time for Oro to take Sasuke's body, then Sasuke would learn Oro's body changing technique to use against his brother. Henge!!.