Dual cultivation with tenfold acceleration, just the thought of it is terrifying!

Little Black Tower: "Of course it's useful. You can only last two hours at a time, which isn't great. But if you go to the first level, that's twenty hours!

"However, the prerequisite is that your wife can withstand the pressure inside the tower. As it stands, she's still far from it. She's already struggling with you, let alone the suppression on the body inside the tower."

Qin Guan nodded silently after hearing this. It seemed he needed to find some heavenly treasures to enhance Nan Rou's physical strength.