I'm 18 now and I've ALWAYS had a sexual obsession with my dad. Even as a ten yr old, whenever I sat on his lap, I used to push up against him and grind him. My earliest sexual fantasy was having sex with my father. He was the one I wanted to lose my virginity to.
It wasn't a crush or falling in love or anything like that. It's just sheer animalistic urges. He was so macho and manly to me and it made me want to be his submissive doll.
I've since realized that nothing is going to happen there and have accepted that. But that fantasy and that urge will always be there.