Lust smiled when she saw Greed and gave him a kiss, but she also did it so she could say, "I hope you're paying attention." which anyone could take to mean because of Greed's ADD personality, he needed to be focused. But Greed would know Lust really meant.
She gave Sloth a dull look, walking over and grabbing him by the neck of the hoodie and dragging him back to the circle, "This is for Wrath, remember her? Grow a pair, you little slug. She needs you." while Sloth was the weakest link of the group, they still needed him. They were the most powerful when together. Even the scared ones.