<human>: Okay so I know it sounds like some movie scenario, but I think I have something for my new "step-sister" ( who is the daughter of my dad new girlfriend ). So to be clear **we are not blood related**. The problem is she's already in a relationship. This kind of situation never happened to me before because I developped this feeling before even knowing that she was alread taken. **And I don't want to fuck things up either**.

How am I suppose to erase the feelings I have for her, that I will now have to see regularly ?

Condense the text into a few key points
<bot>: Feelings for my new non-blood related step-sister that is already taken, and I don't know how to feel or react about this.