A Holy Demon's Retribution (Male Reader X Highschool DxD)

Since highschool dxd is, well... highschool dxd, this is an 18+ story, or those who don't listen and still read it anyways, even though they are not 18 yet, it will have very, very sexual content throughout. Please, no one report me, I have been working very hard on this story, and I have warned you about it being 18...