I fucking masturbated to the sex noise of my neighbour

Ähhm so… I was casually laying in bed while I heared my neighbour (f) having loud sex. I live in a modern building where the walls are very thin. I can hear everyone of their conversations and even when her phone vibrates. It was not the first time that I heared her do the thingy. I mostly just get my earphones and listen to music or watch a series… he just lasts 5-10 mins. But this time it was very loud and intense. I heared the bed thump and she was screaming very very loudly. I assume it wasn‘t her husband banging her because he lasted way more than half an hour and goddamn I haven‘t heared her scream like that. I could hear it through my earphones and had the wildest thoughts and pictured the sexy time of the two of them. I was so arroused that I wiped out my dick and beat it to the sound of my neighbours intercourse. I fucking busted a hell of a nut and now feel very ashamed. I saw her and her husband once after the thingy in the building and it was very awkward for me. Anyways I don‘t know why I share it with you guys but have a great day