Denied sex because Im a sissy

This girl I know is a completely gorgeous and always horny girl. I constantly flirt with her and would give anything to fuck her but the problem is found out I like to wear panties etc and treats me as a girl only. I have to use the girls name she gave me only and can only be around her if Im in panties. Yesterday she called me and asked what I was doing. I said nothing so she that since it was nice out I had no choice but to put on a bikini and lay in the sun. As proof she want tan lines but also pictures. I sent the pics but some of them showed my cock which is quite large and was rock hard. She told me my cock was fucking huge and she would definitely like to have it inside her. I was excited but instantly she asked if I knew anyone with a big cock that would fuck her since I was such a girly girl she knew I can never do it. I tried to change her mind but she no and that I have to stay in panties all the time and start asking my friends how big their cocks are and tell her. About an hour later she told me her friend Britt was there and saw all of my pics. Britt is a friend of mine as well and gorgeous. I did not want her to see me like that really but apparently she loved my cock but laughed her ass off at the panty pics. She put the pics on her phone and is going to show them to her sister and friends but telling everyone they can look at my cock but I am a total sissy and wont fuck anyone because they told me Im not allowed.