He loves you and he cares about you, Michael thinks, as his throat floods with bile. He loves you and he cares about you. Look what he got you. He wants to pick it up and hurl it at William's thick fucking head. It's so cool; were it not for the here and now, he'd already be sinking his teeth into it, wanting to see what made it tick. Instead, he's sitting, legs to his chest, a look frozen on his face that's gotten lodged somewhere between a smile and a snarl. That is to say, all teeth. I'm going to rip your throat out. I'm going to funnel gasoline into your stupid mouth and make you sit in the fireplace. He can picture it vividly, the explosion of gore. That comforts him a little bit. But only a little bit.
"It's nice," he croaks. "Thank you. I love it." He doesn't touch it. If he did, he'd melt, he just knows it. Like the Wicked Witch. What a world, what a world! He is being ungrateful, isn't he? This is an amazing gift. But he chokes on any further thanks, because William is still looking at him like that. How is he supposed to enjoy anything he receives, when this is how the gift-giving goes down? He's starting to think that these are elaborate, expensive setups for an excuse to rip into him. Which is hilarious, because William will let him know exactly what he thinks of him without the gifts, but he supposes the money allows him to feel worse for himself. Poor father. Poor, unloved father. He nearly screams and just manages to abort it, and hopes it comes across as a squeak of excitement. "It's ace. Really. I'm so excited."
And then, because he's a fool and a stove-toucher to the bitter end, he adds, "I'm crushed under the fucking weight of your generosity."