User blog comment:Omega natsu2/Chapter 370: Demons Reincarnated, Predictions./@comment-176.240.167.193-20140203175624/@comment-7418318-20140205211316

No, it wouldn't. Because Unison Raid needs a certain amount of trust or at least understanding of each other.

And the only "interaction" Sting and Lucy had so far was him laughing madly about her being tortured and almost dying from it. Not exactly something that builds trust or furthers understanding each other if you ask me.