Perving on my sister in the pool. Huge DDD jugs in a bikini. My sister is sunbathing and flaunting her big tits. I’m watching her when her hot friend walks in. Friend has F-cups. She teases me and we fuck. Then she goes outside to join my sister and they have wild lesbian sex.
Source: reddit.com/r/eroticliterature/comments/hhun8f/someone_please_write_thi
Message me and I can send you some of my work. I work on commission and my prices are fair.
There are several stories similar to your ideas here written by [silkstockingslover](https://www.literotica.com/stories/memberpage.php?uid=1191173&page=submissions). I doubt their an exact match, but 80%+ at least for a few of them.