Umm , this might be weird but are there two separate spicy scenes? cuase I like have only found so far :/ played it a couple times to
SPOLERS
Yess there's 2!!! You can get both through the good ending.
Everytime you get a chance to fight the darkness you have to let go, when geto finds you and takes you to his apartment you can have one there, disappear and accept the binding, he'll find you again and rescue you from the mirror, after that you'll get another one.