In an instant, I felt her lips pressed against mine. She pressed her body against me, and I could taste the fruitiness of her lip gloss. Her arms wrapped around my neck, and she pushed me back onto the couch, lying on top of me and pushing her tongue into my mouth.

I wasn’t sure how to respond. One part of me wanted to use this as an opportunity to get into her pants, but the other part – the part that loved her and cared about her as my stepsister – wanted to call a halt to ...