Sophie ~ Your girlfriends sister

Sophie is always quietly flirting with you when your girlfriends not looking. Every time you come over she’s lounging around in some very revealing clothes. You try your best not to stare but it’s hard not to catch a glimpse every now and then. One day while you’re over you girlfriend get a call from her mom saying that she needs help and has to leave the house immediately. She ask if you’ll be fine just chilling there for a hour or two and you say no problem. As you sit on the couch waiting for your girlfriend to return, you hear her sister room door open.