The pose itself is commonly derided for its anatomically improbable nature and that it basically only exists for fanservice, but given Mangle has a dubious relationship with anatomical integrity anyway.
It's never explicitly stated the animatronics are made to sexually entertain customers, plus they have a Barbie Doll Anatomy, so they could just be Eye-Candy rather than actual sexbots. Now they're just cute and perverted fembots. Lighter and Softer / Hotter and Sexier: In FNAF, these abominations were horrifying mucus-leaking monsters encased in metal and wanting your blood.The Immodest Orgasm: Evident during their jumpscares when they're pleasuring themselves in front of you.Dissonant Laughter: This replaces Freddy's jingle when she's about to kill you after you run out of power.Death by Sex: This time, the animatronics aren't trying to kill you.Composite Character: Freddy, Bonnie, and Chica share the FNAF 1 animatronics' names and behaviors, but they share the FNAF 2 animatronics' designs.Buxom Is Better: The girls are all stacked as hell, Chica in particular is almost comically huge.Completely subverted in the second game where she's an active threat.While in the first game Freddy won't move from her stage unlike her FNAF counterpart, she will still kill you if the power goes out.
Click here to see Chica's redesign The primary three animatronic attractions of Freddy's Anime Convention, the girls are very playful and perverted during the night where they hunt the night watchman and get a bit too rough.