<human>: Can you provide a brief rundown of the text in within 3 sentences?

My girlfriend (F/26) is a smart, intelligent and dedicated person. She tells me all the time that I'm her person and we talk about the future a lot. We've been dating for about 9 months and I'm her first super serious relationship.

When she was a little girl her stepdad would do creepy stuff like make her kiss him and lick his face. No penetration or anything. I recently found some daddy/daughter porn in the internet search history (Title: Father f*cks daughter at sleepover) and Idk how to feel about it. It bothers me but should it? I feel like she's fantasizing about being with her dad, but that could be an overreaction. I don't want to approach her and embarrass her but it makes me feel a certain type of way that she would be looking at that given her history. 

I'm not judging her in ANY way. I'm just trying to understand this situation. 

Any help would be appreciated.
<bot>: 26-year old GF who had a creepy dad watches daddy/daughter porn in her search history. What does this mean?