User blog comment:Allent15/How was Indra able to take the longinus?/@comment-16281343-20131216195645/@comment-1359322-20131217011152

That SS isn't translated nor compiled, you wouldn't be able to find it for now. And yes those 2 Trivia came from the same SS. Issei and the others went to the Gremory Palace to clean Rias' room under Venelana's orders, happens that Rias is a huge anime otaku, Sirzechs shows pictures of Rias he took when she was young and left Issei with the task. One of the pictures shows a sleeping Rias, and some sort conversation which lead to the Sirzechs-Grayfia thing.