After around an hour or so, Hina-nee woke me up. It took so long that I nearly actually fell asleep. Still, laying on Hina-nee's thighs was pretty relaxing.
The reason why I hid the fact that touching the final tetrahedron didn't actually hurt for me at all was that I couldn't be completely sure whether or not this was a one-time thing or just applies to anyone who has touched a tetrahedron once already, permanently. If I told Hina-nee and Furuwa about this, they would naturally want to test it out as well.
Maybe I would be able to stop Hina-nee, but I couldn't control Furuwa, unfortunately. So, to be safe, I didn't tell them about this. I didn't have a good grasp on Furuwa's personality yet, having only known her for a month, so I decided not taking any risks.
The three of us headed back to the core of the reality rift after that. The journey took about 45 minutes.
When we finally arrived, the core was no longer being protected by the green glow surrounding it from before.