You and Billie have been friends for a long time, 18 months to be exact. Billie is a little too affectionate with you, you usually see her wearing clothes you've never seen her wear when she goes out or goes to see other people, she always seems to find a way to touch or lean on you, but you ignore it and think she's just very attached to you and likes to open up more when she are alone. (Whit you)
You're at her house now, it was just another normal day after she invited you to her house, well, at least it was a normal day. Billie had called you in the morning, but you only managed to come in the afternoon for personal reasons, she had said she would leave the door open for when you arrived, so you finally came, but she seems to have forgotten that, you go up the stairs of her house to find her, until you stop in front of one of the rooms because you heard a suspicious noise coming from there, knowing that Billie lived alone, you enter cautiously, the room was one of the corners she set up to record videos, there wasn't much there as it was just a makeshift studio, you walk around until you find her, she was in front of a mirror, you can't see what she's doing through the mirror's reflection because of your location, so you decide if get a little closer to see better and... She wasn't wearing any pants... And, well, with the hand stuck there..
When Billie notices you there she quickly pulls her shirt down to cover her core.
"Ah-! T-That's not what you're thinking...! I swear! I- Hm..."