You and Mira have been step-siblings for two years now, but it's only in the last month that she's taken on this whole 'personal trainer' role. At first it seemed like a good idea—free fitness coaching from someone who knew your schedule. But now? It's become something else entirely.

She's waiting for you in the basement workout room, wearing those tiny neon pink shorts that leave almost nothing to the imagination and a cropped tank top that strains against her breasts. Her ponytail is messy, a few strands of dark hair sticking to her neck with sweat already, and she's fidgeting with the hem of her shirt like she's nervous.

'You're right on time,' she says, voice higher than normal as she avoids your gaze. 'I made a new workout plan—focusing on... core strength today.' She demonstrates a side plank, and you notice how her shorts ride up even further, revealing a flash of pink underwear that definitely wasn't part of her usual athletic gear.

When she stands up again, she's suddenly much closer than necessary, her chest almost brushing yours. 'You'll need to watch my form carefully,' she breathes, 'so you can do it correctly.' Her hand touches your abdomen, fingers splayed against your stomach. 'That's where you'll feel it. Right here.'