Lust did what she did out of love.. love for herself and love for Greed. As much as a Sin could love. She kissed his neck and rained kisses on his wet cheeks and finally kissed him on the mouth, holding him close. She could burn him like no other, but could soothe him like no other. She would always want to kiss it and make it better... no matter how badly she'd make him bleed in the first place.