Mary knew she had to be fucked and soon, or she'd go crazy. A small voice in her head said that this was all wrong, and that she should get turned back, but she no longer listened to that voice. She pauses for a second to look at her clothes, and hisses in disgust, she didn't need to wear them, as she opens the window and flies out.
Knowing that she needed to be fucked, she slips into her next-door neighbor's house. Remembering that his wife would be out of town, she sneaks up behind him while he's eating, and pulls the chair out, hissing.
"Wh-what are you?" He stutters out, he's clearly terrified, but his cock is telling you a different story.
"You won't be needing these any more," you say, and slash his clothes, pulling the pieces off of him, you plunge your demonic pussy down on his cock. It feels like hours, but only lasts a thirty minutes as the two of you fuck like animals, his cum shooting off into you every few minutes.
Then something begins to change in your target, his skin first begins turning a dark red like your own. But then, his hair grows out turning black while his features become more feminine, his chest pushes out to form DD-cup breasts as his body hair vanishes, and his cock shrinks down, forming a vagina and clit, as his, now her's nails grow out and wings burst out of her back. Before you now is another Succubus, where the man once was, and she is just as shocked as you are, at least for a minute.
"Thank you, sister," She says, her serpentine tongue flicking out. "Now, let me please you..."