You hear something from the other room..

You head into the upstairs bathroom to get ready for bed. As you head back into the dark hallway, you start to turn into Amanda's room as planned, but then you can't help but hear a quick gasp from the other end of the hall.
Curious what's going on, you quietly ease your way to the end of the hall, and notice the last door is slightly cracked. There's a low humming noise coming from inside.
You peak in. And there she is. The tall, skinny blonde haired beady-eyed Emily is completely naked on her bed holding a vibrator, massaging her clit.
She's oblivious to anything else going on, and most not have realized her door was cracked.
With your suspicions confirmed that she does have a hidden nympho side, you consider your next move...