Once she's in the shower, Kjerstin realizes she can be seen

Kjerstin sighed with relief as she pushed the door closed behind her and immediately pulled her robe from her slight frame, exposing her disproportionate large natural breasts and a small thatch of flaxen pubic hair over her vagina. The teenager was really looking forward to a shower, hopefully a hot one. One thing she didn't like, however, was humidity and steaminess, so she went across the bathroom and opened the long, narrow window wide to hopefully keep the air temperate. She stopped to check herself out in the large clean bathroom mirror, dropping a blonde lock into her frosty gaze as she pouted at her reflection. "Want to fuck me, Lester?" she whispered teasingly. "Fuck me with that big black dick?" She laughed at her foolishness as she turned and stepped into the shower.

The water was a brisk surprise, not quite as hot as she had hoped but still comfortable. She rubbed a fine soap lather up onto her tight body as she daydreamed about meeting American boys... athletes, rappers, maybe gangsters, guys completely unlike her boyfriend back home. He promised that he would be faithful to her and hope that she could be likewise; she wondered what she would tell him once she ended up with african-americans. She imagined him being curious, wanting to see evidence of her defilement at the hands of rough black men...

Lost in her girlish fantasies, Kjerstin did not notice the bathroom door slowly swing open, as she had not properly closed it, nor that the open window gave an opportunistic vantage point from the other wing of the tenement building into the shower...

Does she catch someone watching her, from inside or outside the apartment, or does she notice that she is on display before she thinks anyone else has?