Here is my idea for a storyline:
Taste of younger sister
For this story I would like to play two sisters: Ashley (24) and her younger sister Johanna (18 y.o.). Ashley is a girl who has a serious relationship with your character, at least she thinks so. She doesn't know that her boyfriend is a real womaniser without any limits. He finds another target and this time it is Ashley's younger sister. Johanna is young, pretty, but completely inexperienced. She is still a virgin because she is too shy. However she is not afraid of you, mainly because you are boyfriend of her sister. For some reason Johanna starts to play with you, tease you and provoke. Of course you start to compare Johanna and Ashley and your desire for younger sister is growing day by day.
Blackmailed young teacher
Olivia (25 y. o.) is a young teacher in High school. This is her first year while this is also last year for your character (18 y.o.). Olivia is a single and this is one more reason for attention. Many boys and teachers fantasize about her, but only your character have shot. However, this opportunity came after you got a chance to make a couple of nude photos of her in the dressing room. Since then you started to build your own intrigue.
This story should start with sending to Olivia first message revealing that you have her pictures. After that your character, first anonymously, start to blackmail her, demanding more and more from her. I would like to start in a bit subtle blackmail (if it is even possible at first place), the first demands should not included sex, more like sexy clothes, telling secrets and doing other things than normally Olivia would not be interested in.
A girl runs from assassin and police as well
Janet was always seeking for a rich and easy life. She was a girl for a mob boss for a while. However Police finally approach her and gave her a choice: she will become their key witness against her boyfriend or she will be prosecuted alongside with him. Obviously both options were unacceptable for Janet. She decides to steal from her boyfriend and start a new life. Now, her boyfriend sends assassin after her while Police try to realize warrant of arrest her.
Who will reach her sooner? Is she will be able to avoid troubles once again thanks to her sexy body?
This story could go in a various ways. She can't be simply rape by her opponent, she can manage to find protector from third party or to seduce her oppressor.