My sister ate me out

My sister and I have always been very close and so we would talk about everything together. This includes how my husband lost all interest in me and now doesn’t want to do anything to me or even let me give him a blowjob. I was so mad that I called my sister and took her out to eat and we talked. She listened but honestly at points it felt a little weird telling my sister this and when I would bring that up she would say it’s totally ok. She then offered to have me go stay at her house for a while and I agreed. For the first few days nothing happened but one day I told her I was horny all the time and she offered to help. I was definitely shocked at first but I was so horny I couldn’t say no. She ate me out and it was the best thing I’ve felt in a long time. We did it periodically until she decided to tell me that my husband lost interest in me because he had started playing with her. This again intrigued me so I decided to see if we all three could do something together and it was the best sex I’ve ever had. Feel free to ask questions.