Alyx is riding you hard. She loves it on top, and you love it anywhere with her. A small gasp gets your attention, and you see your sister, Felicity, peeping through the door. When she realizes she's been caught, she turns and runs away.
"What's wrong?"
Alyx asks when you suddenly seem very obviously distracted.
"I just saw Felicity watching us through the door."
Alyx looks at you like you're joking before she climbs off of you and pulls on a sleepshirt.
"Let me go talk to her."
You lie in bed trying not to be irritated when eventually Alyx comes back with an odd look on her face.