This little scene shows how much Touta cares about Yukihime. Him saying that being immortal isn't that bad because of her sounds a lot like something Negi said to the Eva-scroll:
Touta: I am glad that you're immortal.
Touta: Knowing that you were alive... was a huge relief. It made me happy. I may have made friends in these two years, but you're the only one I can call family. Besides... If I'm together with you, living an eternal life doesn't seem that bad.