User blog comment:B214/General Discussion/@comment-90.202.240.190-20160531002759/@comment-24.113.252.213-20160601040522

I feel like the "Female Scale Mail" is more like a symbole of how far Issei and Rias have come as a couple and a testament to their compatibility and trust in each other.

Also, if it involves "synchronizing their breathing and aura", than it's kinda like a Boosted Gear version of having sex (I don' mean this as a joke).