When I bought my first house, we really didn't know the people h door. The wife was a bit cunty. She warmed up eventually and we all became pretty neighborly, but, at the time of these events, we didn't really know them.
I noticed them load up their car with luggage and leave. Over the next several days, there were a few people I noticed coming and going, and on a saturday, there were a half-dozen cars there.
fast forward to the following sunday. Late in the evening, they return from their vacation and immediately put their kids to bed. Then, as they are ready to go to bed themselves, they pull back the sheets. Jizz, piss, shit, you name it They run into the kids rooms, pull them out of bed, and it's the same. Every bed in the house has been fucked in, jizz on the sofa, lube bottles in the garbage, etc.
They had hired a girl from the vet clinic to "pet sit" and she threw some wild sex parties. The neighbors told me later, after we became friendly. They replaced every mattress, threw away everything in the fridge (especially the ranch dressing and mayo), bought new linens, etc.