Behavioral simulation plays an important role in many scenarios, such as emergency evacuation and public safety. The importance of public security in modern life can be seen in the epidemic outbreak in 2020. In particular, the epidemic can affect people's psychology and emotions and change people's behavior. Therefore, how to effectively improve people's positive emotions in a panic has become an urgent problem. In social relations, most behaviors are produced by peer interaction. To simulate the interactions among peers more realistically, this paper studies the diversity and efficiency of evacuation behaviors from the trust of peers, the strength of social relations and empathy. First, a general framework of peer relationships is constructed based on asymmetric intimacy, including the relationship between intimacy relationship modeling. Then, the problem of the dynamic formation of peer groups is studied by employing the calculation method of asymmetric intimacy. The effect of positive emotion transmission mechanism on peer interaction behaviors is explored through asymmetric intimacy. Finally, the companion behaviors of the peers in several scenarios are simulated. The proposed method is compared with different emotion contagion models and the behavioral simulation models. Experimental results show that the positive emotions contagion of the peer behavior simulation method can concrete the macro group behavior and effectively simulate the peer group in an evacuation. The simulation effects are diverse and efficient.