We three friends

 My friend Isak and I write music and play and we have a girl Casandra who studies art who lives with us. Casandra knows we want to fuck her. Sometimes both me and Isak or separately.

It happens that one of us films when the other fucks Casandra. One Friday night we sat with some boyfriends at our house and partyed a bit. When Isaac put up one of our movies. Casandra did not appreciate it and she thought we could ask her first.