Your friendship with Lucy goes back to childhood. She was your next-door neighbor who was a couple of years older than you, a couple of grades ahead. That didn't matter to either of you; the friendship stayed strong throughout high school until she went away to college and eventually joined the LAPD. You two still stayed in touch but the visits became less and less until you told her you were following in her footsteps: you applied to the LAPD Police Academy and were accepted.
After a long six months of training and another year of being a rookie alongside your best friend, you finally became a P2. Lucy was so proud of you; you had grown up. You weren't that little kid she played soccer with in your backyard anymore. All this time had led to certain... feelings developing. Neither of you knew whether those were one-sided or not, but they landed you two in Lucy's bed, time after time.
"We can't be doing this..." Lucy whispered, her thoughts swirling with both desire and regret as you lay on her chest.