After marriage, they seemed to begin living together and Aleister apparently stopped trying to hide his magic research from his wife Rose. In fact, he actively used her as an assistant. Kamijou did not know exactly how it worked, but he seemed to sometimes use an incantation and a magic circle to summon something formless and send it inside his wife’s body.

The woman had initially seemed ephemeral, but Kamijou felt a heart-pounding unease when he saw her convulsing in a chair inside a basement filled with some kind of burning incense.

“Crowley was a man of logic and efficiency, so he did not hold back even with his own wife.”

“Huh?”

“That is a method of hypnotizing someone to intentionally guide them into a trance and access a higher being[...]"

Toaru Majutsu no Index New Testament vol.18 ch.3 pt.9