Love neighbours that shared their sex with with others.
For a time my wife and I lived on the third floor of a apartment building that had a very interesting side benefit, the second floor neighbors. It seemed like every other night our neighbors would have sex and the wife was a very loud sex machine! Every time they had sex, she would have three very load orgasms that could be heard through the floor and outside!
At 10:30 at night our neighbors would go at it and the wife would moan so loud. We would be in bed and listen to her moaning orgasms. So night it made us horny and we would masturbate or have sex. Other nights when our neighbor's moans would start we would join in and share the sex act too. It was funny that no one in the apartment building said anything about the moaning neighbor lady. We guessed they too enjoyed hearing her and it inspired them too.
One night after hearing our moaning neighbor, it did nothing for us (it happens) and we just went to sleep. Some time that night I woke up seeing my wife with my erect penis in one hand while she was fingering herself with the other! I did not stop her. I let her finish me off and she masturbated herself to orgasm! I asked her why the special occasion and she said that after hearing the lady moaning get off must have left a lasting impression because when she was asleep she had a wet dream (a nocturnal orgasm) of giving me a hand job! So after the dream she woke up still with a still pulsating hard clit and decided to give me a hand job so she can feel my penis and masturbate herself to another orgasm! Talk about living the dream!
We both were grateful for our loud downstairs neighbor for causing so much sexual fun for us. Many times we would show thanks by masturbating very loud and banging each other so hard it made the bed to be easily heard through the floor. We liked to think it was a good way of saying, 'Thanks!'