I Absolutely Mustn't Fall for My Big Sister

The boy I watched grow up actually kissed me! Zhang Muchen, who had been single for all thirty years of her life, gave her first kiss to Chen Zimo, a boy nine years her junior, and found she actually enjoyed it. When she remembered that he had only just graduated from college and was the best friend of her own younger brother, Zhang Xunmei, she was so embarrassed she could have burrowed through the floor and built a three-bedroom apartment. Zhang Muchen had watched Chen Zimo grow up and seen him with snot he couldn’t wipe clean. Now, though, their relationship had entered forbidden territory. One kiss was like the first domino falling, bringing down one seemingly impregnable wall after another. When love finally broke through the soil, trouble followed close behind.