New Year's Eve: Forbidden Affair

I got to fuck my girlfriend's adorable fourteen y/o sister. It was New Year's Eve and my girlfriend of three years, Amanda, had already gone to bed. She had worked all day and was understandably exhausted. We normally had the house to ourselves but this week was different. Amanda's fourteen year old little sister, Ivy, was staying with us since their parents were on an anniversary vacation. It was nice having Ivy around even if it was a little uncomfortable for me. She had blossomed this year and having her wear her skimpy shorts and tiny crop tops around the house did a number on my cock. I decided since Amanda had gone to bed that I probably should too. I went downstairs to get a glass of water and saw something I didn't expect to see on our couch. It was Ivy and she was touching herself. She was wearing a sports bra and tiny cotton shorts and her hand was definitely shoved down them and pleasuring her fourteen year old pussy. I stopped dead in my tracks and just watched, my cock springing to life to no surprise. She didn't see me at first, she was focused on her phone (probably porn) and focused on rubbing herself. Without thinking, my hand flew to my cock and began stroking it furiously at the perfect scene in front of me. I must've made too much noise because she stopped what she was doing and looked up directly at me: her sister's pervy 28 year old boyfriend. Instead of yelling like I expected, she smiled devilishly and whispered "Come here."

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