She was listening
I live in a very rural area.... There's like 4 houses on my whole street. We have cell phones but the service is very unpredictable sometimes it's good sometimes it's non-existent. Even our Internet is slow and sucky.. So a lot of houses still have home phones/ landlines. It's the only reliable phone line.
My GF and I live pretty far from each other and only really see each other like every other weekend so we spend a lot of time talking on the phone. Well late at night we sometimes get freaky on the phone. One Saturday night we were in the middle of some nasty phone sex when I thought I heard something that sounded like clicking. I was about to stop and check it out but my GF said something dirty and I just kept on going. Over the next few times we had phone sex I would hear the same clicking noise but could never figure out what it was. Till one night we were going at it and I heard the same click, then heard my sister's dog barking. The dog was in her room so it was muffled but I could also hear it loud and clear through the phone and that's when I realized the clicking was my sister picking up the phone and listening in. She had been listening to the last 5 or 6 times we had phone sex. I knew she liked it cause she would always ask if I was going to call my gf that night, she made it seem like she wanted to know so she would tell her friends to text her instead of calling the house. I kinda liked it too... It started a whole lot of stuff between me and her.