When I Came Home After Graduation, I Found Out That My Mother Had A Bunch Of Younger Sisters

Su Heng was stunned. He went to college for seven years, and when he came home, he found that his parents had secretly given birth to a second child behind his back!Moreover, there are four lovely younger sisters!Su Heng, who has never raised a child, represents Alexander.But fortunately, the pet sister crazy devil good brother system is online!Pick up the younger sister and reward the perfect physique;Telling stories to lull my sister to sleep, and rewarding artistic versatility;Buy a skirt for my sister, and get double rebates...Just when Su Heng was obsessed with being a sister-in-law and couldn't extricate himself, he realized that he was famous, and all the young ladies on the Internet wanted to be four cute sister-in-laws. What should I do...(The introduction is weak, please read the text!)