Howdy y'all.
Looking for some romantic stories of (an) older sister(s) becoming romantically involved with their younger brother. Preferably all over the age of 18, and no other incestual elements. No father/daughter, cousins, mother/son shenanigans.
Tooting my own horn:
https://storiesonline.net/s/17357/my-lovely-fat-sister
It won a clitorides.
If you're premier level member, you will find a bunch of my stories fitting your criteria.
Look up Losgud's stories. Pretty well written and funny stories about bro/sis entanglements. They are all short and mostly about 27 years old (the stories, not the characters). They're not even Premier stuff yet, so have at it!
https://storiesonline.net/a/Losgud