I want the girl's brother to burn us ⇐ Incest

[Anonymous]

Hi all. A girl appeared relatively recently, our relationship is developing quite quickly and, despite the general modesty, she is opening up more and more and is ready to experiment. In the summer we are going to go to her house to meet her relatives, and her mother and younger brother live there. My brother is already kind of an adult, but compared to us, he’s not very much, and he’s quiet, he hardly communicates with anyone, much less is not popular with the opposite sex. Again, the girl is ready to experiment, we had sex in front of the window, on the balcony, in the forest park, but we didn’t even discuss the fact that the family saw something. It’s embarrassing to even raise such a topic. But as a result, thoughts about this trip led to the fact that I really want her brother to burn us down. The thought of him watching me fuck his sister is very arousing. And then, you see, we’ll let him take a closer look, or even his little sister will help him relieve the tension.
What do you recommend? How to talk to a girl, is this even possible, is it a good idea to show off like that in front of your brother?
*It would also be great if her mother burned, from the photographs she is quite pretty. But I think the topic is more suitable for this forum*