I grew up in a two story house and in the house behind us lived another family with two daughters. The eldest daughter was probably 5 years older than me (I was probably 15 at the time) and her bedroom window was directly accross from mine at a distance if about 40 metres.
One night whilst in my room I caught her changing after work with the curtains wide open. Need less to say I was speechless and subsequently spent every evening 'studying' in my room. My parents were super proud.
I almost turned into an obsssion - I would watch her get changed for work in the morning, unchanged in the evening and then getting ready on a saturday night.
On 3 I also caught her having sex with some guy - those were all wonderful days.
Probably a year after this voyeuristic activity I was indirectly invited to her 21st bday where I met her for the first time. She was really sweet but I found it difficult to look her in they eye. I got no indication that she knew who I was or what I had seen but it was awkward none the less.
I kept it up until she moved out. Ahhh the memories