Its 1974 and 18-year-old Viv and her older brother get caught in flagrante delicto -- naked and asleep in her bed by their parents who were "supposed to be elsewhere." (Consanguine love and sex, Female on male, and male on female oral sex.) Installment Two of a journal (2019 is first.)
An older sister finds her younger college sophomore brother blackout drunk naked on his bed and can not stop herself from trying him out for a ride and leads to some unexpected consequences for her and a younger sister of her BFF
Brad and Carol are brother and sister. As twins they grew up being very close... mentally and physically! Now in college and sharing an apartment, they become lovers. This leads to interesting sex and then concern about how or if they will tell their parents...
Liz was fourteen and pretty much obsessed with sex. Far from unique in itself, but it was made worse because when she was aroused, which was often, she tended to make some pretty poor decisions.
A older sister returns home after she is deserted by her husband. She does not want to decide things or face life's many choices and surrenders that power to her younger brother. He discovers her sexuality and needs for affection.