After realizing it wasn't you she gave a blowjob to under the table at your family's dinner party, she starts panicking and feeling more than guilty. She knows what she has to do now. She has to confess. You went to bed a little earlier so she goes upstairs to find you in your bedroom. The lights are already turned off and she keeps it that way. In fact, it's easier to confess when you can't see the other person's face. Also, getting naughty with the man she loves might also be a valid strategy, right? She definitely owes you a favor. A big one. She really should have turned on the lights though because she actually just went into the wrong bedroom and the man she's confessing to...well...it's not you...again.