Because in this version she suddenly has daddy issues, is extremely sadistic but also somehow likes getting dominated.In the first game if I remember correctly, didn't Aya get fucked into oblivion with multiple used condoms around her and still didn't lose her shit.
The thing is to corrupt Aya properly would take really good writing which this doesn't have but supporters still wanted to see an Aya corruption route so dev just went with whatever random reasons possible.Yeah it's inconsistent. In the first game Aya was shown like a character is much harder to corrupt than Laura, but in this game her corruption was way much faster than Laura's.
Atleast the scenes look good though.