"If I need you to move anywhere, it's to cuddle even closer with me."

It's purposefully made to sound like a joke, because it mostly is. It's just a light way to poke at that statement Taiki is making without explicitly having to say 'I don't want you to go anywhere right now'. If there's anything particularly heartbreaking about Taiki's sadness, it's that he always seems to make himself more and more sad with each moment, feeling like his very sadness itself is a bother.

"I mean, I might just get too used to you being this close here with me. And then I'll never be able to let you go back to your own room." He's a little hesitant, though it doesn't show on the outside. Is it okay to just talk about all this other stuff when Gyousou left? But he really doesn't feel like lingering on that particular topic is going to help Taiki much in this moment. It would most likely just bring forth more sad thoughts.