Half a day flowed by.
Tang Yin could have ended things much quicker, but Fei Yu was a beautiful woman, he certainly wouldn't complain about spending more time with her.
After spending half a day brutally ravaging her, Tang Yin discovered to his delight that the Heaven Devouring Abyss had a small reaction to Fei Yu's special Yin Energy.
His hypothesis was indeed correct. A cultivation furnace with a Cultivation Physique could provide an additional amount of whatever special attribute a Cultivation Physique contained.
However, Fei Yu's Ice Lotus Meridians were considered as one of the most mediocre Cultivation Physiques.
The reaction of the Heaven Devouring Abyss was miniscule, akin to a small buzz of excitement. Tang Yin could barely feel any change from the Martial Spirit until he devoured Fei Yu. The benefits were evident.