>Raise our eyebrows. "Aah, I misunderstood. Hmm. If only I still had both copies..."
>Frown. "Actually, I'm not sure if the other copy is truly lost. It's a little confusing, but to explain... this is actually the second time I returned from the future. The first attempt was a bit of a failure, only returning me to this time for a few hours. As a result, I'm not... entirely sure whether there will be a second me running about or not, tomorrow; that is, the Sakuya from the first attempt to send me back. If there is, we would have two copies of this grimoire. I could simply give one to each of you."
Of course, one would be more advanced than the other, but Patchouli wouldn't need to know that. There... likely won't be two Sakuya's, but we honestly aren't sure of that, so who knows?