Dan had just finished inside his daughter's childhood best friend while watching his daughter get railed by a masked superman. He couldn't believe his ears when Callie asked Amy if she wanted to switch. It was one thing to watch his daughter have sex but it was quite another to have sex with her. Dan's head was reeling! He had, like many dads probably do, thought about it before. Especially as Callie got older and looked more and more like her mother. In fact, she was now the same age as her mom was when Dan first started dating her.
Callie was as surprised as anyone when she asked Amy to switch. What Amy and Dan didn't realize was that Callie had figured out that Spiderman was her dad. Callie had heard Dan privately masturbate over the years and she recognized his grunts and moans. The question now was did she let on that she knew? Callie and her Dad had been alone since Mom died. Dan really hadn't dated much as he put all his effort into raising Callie. When her mom died, Callie was 10 and for a few months Dan had let her sleep in the same bed as he did. Pretty soon Callie started puberty and Dan decided it was more appropriate that Callie and he not sleep together. Callie grew up idolizing her dad and maybe like other girls fanatsizing about making love to him. As Callie got older and developed into a young women these feelings didn't go away. She would sometimes tease her dad by wearing just her bra and panties as she got up in the morning or just a towel after a shower. She was sure he noticed but he never gave any indication he would do any thing with her.