Tied Up with Vines from the Start, I Ended Up as Her Power Bank

Yang Yunhan transmigrates to a chaotic Republican-era world overrun by demons. With no System and no golden finger, he can only make a living sweeping the floors for Uncle Jiu. Until one day, he's shoved into a trial chamber and forced to face Sīténg, a thousand-year-old female demon. At the brink of life and death, the [Do It a Billion More Times] System awakens! Draw a talisman once? It automatically copies the process a hundred million times, maxing out his proficiency! Get corrupted by yin energy? A billion rounds of forced tempering awaken his Extreme Yang Body! A female demon tries to drain his yang energy? Sorry, my yang energy is on a nuclear-fusion level! In the blink of an eye, he rises from a lowly sweeper to the ninth level of the Fangshi realm, and even pins the female demon down and force-feeds her until she levels up into a great demon! But his two senior fellow disciples grow jealous and frame him, while Uncle Jiu believes them and kicks him out. "You throw me out today, and one day I'll make you get on your knees and beg me to come back!" Armed with an heaven-defying System and grounded in orthodox Maoshan teachings, this time he'll make everyone who looked down on him eat their words!