Timothy needed that reassurance, for Aster to verbally dispel his near constant fear of being treated like he was subhuman because of the tail; it wasn't rooted in baseless fear though, especially not since Dolores Umbridge had been let loose on the school, nevermind anyone else. He smiled again though because Aster just tickled that out of him with his sweetness and his constant, steady acceptance. Timothy pushed his leg a little between Aster's and entrapped one of Aster's between his own almost without thought, snuggling in already.
He nodded that he agreed and then chuckled at Aster's flattery. He was going to say something but Aster knocked words from his mouth by petting through his hair and he couldn't resist that, especially not with the cat in him. He made a little sound of content and curled in closer towards Aster's hand and that touch, his tail taking the chance to eke back out and curl itself against Aster's knee, his hands moving to take hold of Aster's pajama top and just stay there, holding on.