Top a Pretending to Be B, the Bamboo Horse Is Not Happy

[Dual male protagonists + ABO + time travel + slightly sweet + 1v1 + HE] When Pei Jingshi opened his eyes, he found that he had entered a world divided into multiple genders. The culprit is a system called "Good Fate Yuelao". When the system tells Pei Jing, he must complete the corresponding random tasks and ensure the completion of the main task. Pei Jingshi was helpless, "I can complete the mission... But are you sure I can go back?" The system patted his small chest confidently and gave a thumbs up, "That's for sure!" Later─ The gentle bamboo horse brother Chaochao suddenly lost control and suppressed him! Pei Jingshi remained calm and suppressed his shock, "Brother?" Zhu Ma gently sniffed the glands on his neck, his eyes reddened, "Are you pretending enough, Jingshi?" Pei Jingshi's pupils were slightly dilated, his heart was beating hard, and he pushed away the person in front of him who was suppressing him. He felt annoyed when he spoke, "... Brother..." Tsk, why are you calling me brother? ! "Xi Baijun! Calm down... Be sure to calm down!" System, think of a solution quickly! After witnessing everything, the system was suddenly locked in a small dark room:... It's over...