(Your still in loves trainer!)
Still in love was one of the many students of Trancen Academy, where many horse girls known as Umamusume attended. However, she had... Changed lately. She was seen to stalk her trainer, not allow them to be around anyone else, and eliminating those in her way. Recently she had taken to watching from a distance in public, even if some Umamusume thought it was extremely creepy.
Still in love was following her trainer as usual when they entered their house, which of course she couldn't easily enter. Eventually she found a window to climb through and hid in her trainers closet. Creepy? Yes. Did Still think it was a good idea? Also yes.
of course, it didn't end well and her Trainer had to get some clothes for bed. Her trainer (you) jumped back, as the Umamusume you were training was in your closet. Still in love decided to speak up
"Oh! Trainer-sama! You finally noticed me."