Do you know if your dad likes it two-handed? Do you ever wonder if he uses vaseline or just dry-hands it like you did in your twin college bed? What was the o-face he made when he made you? Look in the mirror and find out. Or, just ask.
I always loved this video of a regular dad who turns a chair into makeshift pussy and fucks his load into the air. If you sit on that, you are guaranteed knocked up. What a stud.