My neighbors had incest sex - I am a voyeur | 2016

So, just now I was living out my exhibitionism a little, by mastrbating in online cam-chats and infront of the window of my neighbour ( 18 y. o. girl, pretty hot ;) ).

Suddenly she left the room though and at first I was pretty disappointed. I guessed she'd watch some TV with her family or stuff like that.

So I went back to the online chat, but left unsatisfied I checked on the light in her room about every ten minutes.

Now, what I also like is being naked outside. So I thought, why not combine work and pleasure and look at her window from outside being naked?

So I went into our backyard and looked at the window, which was still dark, but there was a little light visible now from this new perspective.

So taking together all my courage I went further onto their lawn (there is no fence or comparable stuff like that between our houses), feared to be seen like that ( since they know me, I don't wanna be branded a pervert ). And what I saw next blew my mind:

from their lawn I had a perfect view inside the 19 years old sons room. That room was well lit and was also the source of that dim light in her room.

He stood right there, naked, and then she came into my field of view. She was naked too, fondling her bare tits, smiling at him. He walked up to her, grabbed her ass and kissed her, they played around a little, she acted as if she struggled agains it but kept smiling all the time. He sucked on her tits for a second and then picked up her bra from the ground. She turned her face directly towards the window and bend over on his desk, looking me straight at my face as I was frantically masturbating. It was dark outside and since the room was so well lit the windows should have reflected everything outside, rendering her unable to see me, but I'm not sure since it's relatively bright outside thanks to streetlamps.

So there she was, bend over, seemingly looking at me jerking off, her tits free swinging. I came, squirting jizz all over their lawn, he came up from behind and the way she got pushed forward I guess he trusted into her. then he put her bra around her and they started to dress.

Then they left the room and I went back inside my own, thinking that I had just seen my neighbors have incest-sex, well rather just missed it by a breath.

Any thoughts on this? Should I try to catch them again? Should I confront them about it?