An adult brother and sister (with flashbacks to their teen years) and his two teen daughters and their life together, swinging with neighbors, until they come to realize that they are more than just brother and sister. Note there is bisexual male/male sex and some watersports.
a cheated wife takes her teenage son on holiday in place of her husband.
slow to start but i can see a lot of possibilities if the feedback is good (as usual)
Bob takes his daughter for glamour shots but turns down the photographer's offer to do sexy shots. Instead he decides to do them himself. Trouble is instead of getting pictures taken, she just gets bred.
A father lusts for his voluptuous teenage daughter. When the opportunity comes for him to tutor her, he seduces the not-so-unwilling girl. She herself, though shy, craves for fun.