Undertaker noticed the expression on Lucifer's face, seeing how he went from relaxed to serious in a matter of moments. He hadn't realized that Grell had come there because of a demonic problem not relating to Michaelis- at least, he didn't think it was related to him. He could be wrong on that but only one person had gone after the young demon so far.
If the rest were after him, it was rather strange that they hadn't made a move yet. It was entirely possible they were waiting for him to be more vulnerable, but for the moment it seemed unlikely. With Michaelis near Lucifer, he was pretty much out of reach of anyone who might harm him. Undertaker's longtime friendship with Lucifer gave him more insight into the Demon Lord, for he remembered Lucifer before he'd taken over his father's position.
If Lucifer himself couldn't keep Michaelis safe- and that would be a rare thing indeed- then Undertaker would step forward to help him. Not for all this time had he helped to keep Sebastian safe only to see him hurt now. Michaelis was finally old enough now to learn the truth, but the truth, if it reached the wrong ears, would endanger him.
Undertaker could still remember how cute Michaelis had been when Lucifer had first brought him here; he'd been a scrawny little thing that was starved for both food and affection. Feeding him had been tricky, though, because the child hadn't been weaned at all to any sort of physical food. Even despite his young age, he was too old to be nursed by his mother any longer. But she clearly hadn't been feeding him properly; he threw up what he should have been eating because his stomach wasn't used to it. He was old enough now that he also needed more than just milk now to live.
It was too soon for Michaelis to be introduced to feeding off of souls, though; first he had to be brought back from the brink of starvation. Undertaker hadn't even been certain if Michaelis was going to survive what he'd been through. Lucifer had finally come up with a solution; he'd used a combination of formula and herbal supplements with his own blood mixed in to give Michaelis the nutrients he'd desperately needed and not received.
Most demons wouldn't have gone to that extreme to save a child, not even their own; sharing blood was practically taboo for anyone but a parent and child in the demon world. Only Undertaker knew just how Lucifer had fed Michaelis for several weeks before introducing more solid foods at a very slow pace. Because it was Lucifer's blood, Michaelis had gained strength and power directly from him.
It was a good thing that Lucifer was able to give Michaelis his blood, though, because of how badly he'd been beaten by that arrogant Drake that had dared to call himself a demon lord. Lucifer's blood would definitely help the younger demon to heal faster once it fully entered into his immune system. Until then Michaelis really was more likely to get an infection in the human world, especially with his back still raw.
It definitely wasn't a good thing if demons were running amok in the human world, though, but at least Lucifer had the authority to handle something like that. That should be enough to tell William and the management in charge of the Shinigami that the slaughtering was being taken seriously. Lucifer was as much of a legend as he himself was, Undertaker knew.
Undertaker's eyes then went back to Grell, from where he'd been watching Lucifer next to Michaelis. The younger Reaper really was too cute when he blushed like that- and he was blushing again from how everyone in the room was staring at him. His expression softening, Undertaker gently squeezed Grell's hand in silent reassurance; he'd never released it after pressing a kiss to it.
"Uriah?" Lucifer questioned, seeing that his old friend was simply staring at Grell and not even paying attention. He'd said the retired Shinigami's name twice now and he still hadn't noticed.
Jerking his gaze away, Undertaker gave Lucifer a quizzical look, still holding onto Grell's hand. He could see slight amusement with a hint of something else in the purple eyes that watched him closely now, though he wasn't sure what the other emotion was. "Yes, Luce?"
