User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-34061653-20190122110131/@comment-2602:306:CD9A:C860:4849:7F0:473A:32D7-20190127051538

Issei overcoming Rias countermeasures against Issei's perverted techniques comes as no surprise as she isn't the first who's tried. Sairoarg and Dulio did the same thing only to end up in failure. The only people that did have successfully countermeasures against Issei specifically was Sona and Cao Cao because they actually defeated him.