If Greed was a normal boy, she might have teased him with a fictional person but considering she was sure his jealousy over the pillow was 100% real, his jealousy over a person, fictional or not, would probably reach homicidal levels. So she found ways of having a normal playful conversation, like replacing person with pillow. She grinned, "Really? You sure you want me to do that?"
Lust knew Greed needed to get his fill. She always knew that if left to his own devices he'd never get his fill. He'd keep Zoe on the phone for hours. She sat up and moved closer to him, her hand slipping under his shirt as she raked her nails across his abdomen using some influence there to remind him of what was waiting. She was letting him talk on the phone, he could ignore her mouth on his neck as she bit him lightly.