A succubus

The first thing you see of Gabrielle changing are her proportions. Her hips widen, butt becomes rounder and her breasts swell up to become a proud D cup.
When Gabrielle stops screaming from the pain, a pair of horns start growing from her head. They start from her forehead and curl backwards, like those or a ram. If they weren’t a sign of demonic nature, you might have considered them beautiful.
When the shadowy spear is almost completely absorbed by her body, you see a new protrusion grow from her pussy. No, it’s not new, it’s her clit, but it is becoming grotesquely huge. No woman should have a clit like this. But then Gabrielle’s clit grows also in girth, becomes rigid and develops a head like a penis.
Once the corrupting essence of the spear has been completely absorbed by Gabrielle’s body, she’s got a mighty black penis between her legs.
You can’t believe you’ve just witnessed your African friend transform into a black succubus.

Gabrielle stands up, checks out her new body, then suddenly doubles over and reaches for her dick saying “No.”

“What’s wrong?” You ask.

“It’s this … thing.” Gabrielle says while she masturbates her penis. “It has a mind of its own.”

You want to help but … Gabrielle is a daemon now. She has become the enemy. You should fight her. But, she is still herself right? It’s just her body that changed, not her soul. Then again, the soul is the first thing corruption attacks, breaking away a human’s morals, transformation is corruption going into overdrive.

Is she still the same Gabrielle you’ve always known? Is it worth to help her?