User blog comment:B214/General Discussion/@comment-4547267-20160720181439/@comment-4547267-20160720200003

The reason is Issei best day is the following list

He get to see all the girls naked

He get to be naked rubbed by all of them

Kiba and Gasper didn't get to see them (it's more funny than anything)

And he get to be the one who deliver all the panties back, which seems a lot of work, but Issei seems to like it XD