Did My Good Dog Seduce My Sister Today?

[1V1+Double Cleansing+Sweet Pet+Two-way Redemption+Long Planned+Four Year Age Difference] Passing by by chance, Yun Shu picked up a younger brother and took him home. My younger brother is well-behaved, sensible, and considerate, but for some reason, he looks gloomy. One day, Yun Shu learned the truth and said nothing. The next day, the Pei family's only overseas market was blocked. The Pei family was confused and anxious. … Yun Shu felt that since Pei Yuchen called her sister, she must raise him well. But as time went by, unknown feelings quietly sprouted between the two. … One day, after being drunk and being ridiculous all night, Yun Shu left Youcheng with a guilty conscience and disappeared for three years. The next time they met, it was in the lounge on the second floor of the dinner party. She ran into his arms, with an expression of panic and a look that concealed the determination to win. * Pei Yuchen: "I am my sister's most obedient dog. Of course I have to hit wherever you point me." Yun Shu felt itching in his neck: "!!!" Pei Yuchen: "I haven't seen you for a long time. My sister has become indifferent to me and only cares about my other brother." Yun Shu, who was hugged by his waist, said: "? Are you jealous of your own brother?" "I even have a status, and my sister secretly goes on a blind date. Isn't it enough that I am the only one?" Yun Shu, whose red lips were blocked and unable to explain: "..." (PS: There is a contrast between the male protagonist's character before and after)