Going out of our comfort zones because its exciting and taboo

My fiance (F25) and I (M26) never considered ourselves kinky or necessarily naughty. We obviously love sex but sharing intimate moments with others is never something that we felt comfortable with. We just moved into our new home and whenever my fiancé is doing her morning stretching in the backyard or the living room we noticed that the neighbour boy (M18) is watching from time to time. He is trying to be low key but sometimes its hard to miss. We tried telling his parents and so on but his shameless behaviour continues. I feel like it has gotten so awkward and annoying that part of me enjoys it. I also see that my fiancé is trying to not let that put her in a shell. So at the end we all said just fuck it and let him look. Honestly its kinda exciting especially when we are by the pool. Once when I made out with her I could see that he is watching and scheming…