User blog comment:B214/Talk About What You Want! 3/@comment-24552694-20141218135002/@comment-1359322-20141218135625

Why can't people get it through with the gender raygun thing?

First, it won't even work on Vali in the first place, just like how it didn't work on Issei. Second, Ishibumi made the gender swapping raygun because he though it would be fun, but when fans started speculating on the Yumi thing, Ishibumi made another SS to have the Raygun sealed, so that he could end all that speculations, and seal the Raygun's existence once and for all.