His Favorite by Evie Clark

Zack:
If I’m being honest, I’ve always had a thing for her.
She’s pure, untouched by this garbage world.
Smart, witty, and gorgeous beyond compare, there’s only one problem.
She’s my stepsister.
I’m watching over her as she starts her freshman year of college.
Making sure she’s not getting into trouble and no guys bother her.
I also have a plan of my own.
Whether she wants to own up to it or not, I know she has feelings for me to.
All I have to do is convince her to stop lying to herself.
That’s when the real college fun begins.

Logan:
College means getting away and finally having fun.
Of course, there are classes and homework, but aside from that
I just can’t seem to shake my stepbrother Zack.
Charming and dangerous, all my friends seem to think he’s the hottest guy on campus.
I can’t argue, but I’ll never admit that to him.
At least, I wouldn’t before.
Things are a lot different now.
The more time I spend around him, the more I realize that I’ve always had feelings for him.
And now that we’re away from home, I think it’s time to explore them.

His Favorite is a 20,000-word novella with no cheating, no cliffhanger, and a guaranteed happily ever after.