You all know what happened at age beginning of DxD anime. Where Issei got saved by Rias or to be exact he was all along planned, Rias set him up to use him, thpigh later on she unknowingly developed feelings for him. But that is the story of alternate timeline. So, what would happen if Issei got to know the whole truth of the incident where he got killed, why Rias saved him, and all the otger tgings that he didn't know. So, if you wanna know what will happen what will he do and how he will react when he got to know the truth of it, want to know then you have only one choice which is to read the story.
You must really hate everyone in rias peerage especially rias considering koneko never liked perverts but somehow loves issei jobs would still be friends with the mc cause that's just hiss character and rias would never hate the mc for hitting issei when he was acting perverted to them considering koneko did it countless times