While enjoying Lucien's kiss, Pride lowers her energy barrier, allowing the other women to see that scene.
She still thinks he can only be hers and that it will be like that when he doesn't need the power of his other wives in the future, but she doesn't intend to hide her feelings anymore.
Why hide from others how much he already loves her, anyway?"
When the girls see that scene, they have mixed reactions.
"NO WAY!!" Greed is clearly shocked to the soul.
The most ambitious Sin can't believe that Pride actually let a man kiss her lips.
After seeing Pride say that no man would ever be good for her since ever, not just Greed, but all the other Sins, were sure she would be alone in the end.
Greed knew Lucien was special the first time she saw him. The fact that all women desire him makes him one of the most precious treasures she has ever seen.