Rival Sisters

I have been married to becky for 5 years but we've been together 6. She's 5'5 slim big tits and blonde also 10 years older before we got together I was dating her sister who is 2 years younger but didn't know they were related till after I proposed.
So they have this little back and forth they do whenever Tina stays where she makes a comment or compliments me and becky gets really possesive like Tina's going to steal me. During lockdown we were all together because it was better than Tina travelling for work. Then she got laid off So I got in some drinks to lift her spirits a bit. We ate we drank and watched a movie which as it ended Tina announced how its weird because normally when watching movies with guys she's sucked and fucked before it gets to the middle, becky did not like this but as she had been drinking decided to grab my dick instead and tell Tina she can't have it it's hers and proceeded to start sucking me. to my surprise Tina watched and put my hand in her shorts where I discovered she was smooth and dripping wet and my finger went in with ease. After playing with her for a bit she went down with becky and they started sharing me and instinctively I just reached out and started playing with both of them until they both came. Then becky climbed on reverse cowgirl and started riding me while Tina was still down there without thinking I pulled Tina's head in and she licked beckys pussy and my dick each time becky lifted up and the more I played with her pussy the more she did it. Eventually I came and they both came again. Tina sucked my dick clean and licked the cum off beckys pussy. We've not spoke about that night and they just act like it didn't happen but I really want to do it again and everytime I try to make it happen again it fails.