User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-1359322-20141119194655/@comment-16281343-20141120143513

Looks like someone got his facts wrong.

"“I see. The reason why Gasper dresses like a girl is because I played with him by making him wear it when we were little. He was against it in the beginning, but he suddenly started wearing them on his own……ufufu♪”"

@Gary Actually Koneko knows Gasper way back since she is already in Rias' care before Rias found Gasper.

The order goes: Akeno → Koneko → Kiba → Gasper → Issei → Asia → Xenovia → Rose.