User blog comment:B214/High School DxD Hero Discussion/@comment-30780538-20180331063512/@comment-86.171.209.223-20180403073005

I think he's talking about vol.10 when Rias is pressured by her mother to progress with Issei and she throes herself at him in the sauna then he gets a flash back of Raynare and pulls back a calls her President upsetting her and the other girls know shes upset and Issei's the cause, They are upset because they don't understand holding him back until Koneko, Asia, and Akeno work out that hes still in pain from Raynare and make up their minds to heal him of her once and for all. But I personally think their description of almost break up to over playing it from Rias point of view  she was upset because she thought that he couldn't see her as more then his master and couldn't have a relationship with him.