Hm. She liked them? Their presence gave her happiness? That was very nice of her to say (at least they assumed so), but as the amalgamation sat pondering they found they couldn't conjure the same emotions towards her. She did matter, of course, and they did call her their friend (it was only logical after she helped them so many times), but the "happy" part didn't come as easily. He was enthralled by magic, that made him happy, but gembounds only gave as much passion as a rock. They figured it was just another way the two of them were different.
And another curiosity: magic did different things, apparently. They were just used to their light and plants and the quiet, subtle magic of Arwen. Perhaps he'd see more instances of the different magics someday. Someday...
"Nice to know," Matthieu giggled. "Very, very nice." Boy clasped his hands together, mimicking how the grub had did it just earlier. "Brain bleeds," they cooed, "Sound veeeery fun. We wish we could do the same magic. Make all the bunnies scared." Another short, childish laugh.
A bit tired out from all the talking they've been doing, they leaned back (or forward, in the bee's case), planted his hands firmly on the floor, and looked up at the ceiling moss. It looked almost like stars, but they didn't know that. To them it was just shifting hues of blue and green and orange interspersed with twinkling lights. 'Beautiful.' Stargazing and brain aneurysms weren't topics typical children thought about at the same time, but for them they coexisted happily in their terrifying young brains.
"Look up. The roof is very pretty. We think we're going to... look at it for a bit. Think." he yawned, pointing a finger to the dazzling display above.
And just like that their childish, drifting conversation about magic and friends and world domination and illness slowly quieted. Just two-and-a-half young fairies on a boulder, the threatening crackle of the Spire mere background noise.