Kyon had spent two and a half days looking after the unconscious strangers.
After the first hours of healing, their souls were strong enough to prevent Synergy from getting into their bodies. Only the timely applied formation could teleport it directly to their brain.
The wounded girls had almost completely recovered and were about to wake up. Their monstrous regeneration caused by their high cultivation made Kyon question his plan. How quickly would they regain their memory? He'd have to reserve the lion's share of Synergy to slow down this process.
The girls had also rejuvenated to the age of Juno when Kyon first met her in the mansion. Their bodies also resembled that of the little demoness. Their facial features had slightly lost their mature charm but kept their natural beauty.