That was when a strange aura of fear came from Patricia’s entire body while she trembled in the corner of the room. A sharp crack seemed to run through her soft cheek and something like an octopus tentacle filled with bubbling eyeballs or suckers showed itself. There were also glimpses of the colors of a strange poisonous frog or lizard.
It bent, twisted, and formed a single sharp spear before shooting out like a bullet.
[…]
“That…didn’t seem to be under your control.”
“…”
Patricia remained silent and a change came over her chest.
A pulsation was evident even through her puffy down jacket.
However, it clearly did not come from a human heart. Something else was wriggling at the center of her chest.

Toaru Majutsu no Index New Testament vol.14 ch.2 pt.5