Allison's dressed more like a prostitute than a girlfriend meeting her boyfriend's family

A short time later, when the doorbell rings, Fiona's the first to reach the door. Opening it, she takes a look at Allison, then stares a bit longer, before covering her mouth with one hand and barking out a short laugh.

"Well, guess you better come inside...that looks cold." You don't get what Fiona means until she walks back into the living room with Allison. You and Elsie are the only ones in there, and both of you stare at Allison as she comes into view.

You've seen Allison clothed, you've - recently - seen her naked. But you've never seen her with so much skin exposed while still 'fully clothed'. She's got a miniskirt, heels and a skimpy little top that shows her shoulders and most of her belly...to top it off, she's wearing a more obvious shade of lipstick than you've ever seen on her...the whole look seems to be designed to scream "I'm a slut".

Which was likely the intention...Allison probably felt like you were the only one putting in an effort to spice things up and decided to do something herself. It would have been a nice touch if she wasn't having dinner with your family...

Elsie leans over and whispers into your ear. "Mom said you were inviting your girlfriend over and that we were going to let her in about our secret, then maybe 'experiment' a bit...are you sure she doesn't know already?"

"She doesn't." You shake your head in denial, still a bit dazed at Allison's appearance.

Allison's blushing furiously as the two of you exchange glances...this is far from how she'd normally dress, and even if she worked up the nerve to rush over here wearing it, she probably only intended you and 'your friend' to see her in it for any extended period.

Elsie whispers again. "Are you sure? I think Fiona's groping her butt already though..."

You lower your gaze, and sure enough, Fiona's got one hand behind Allison, apparently feeling her up. A slight lifting of the skirt makes it obvious that Fiona's got her hand beneath the flimsy miniskirt for a more direct feel...all of a sudden, Allison's blush takes on a new turn.

She's not just embarrassed at dressing like this, she's embarrassed that your sister is feeling her up so openly...you don't get the impression that having a girl touching her is unpleasant either. If anything, Allison looks like she's getting a bit turned on by the situation of having her boyfriend's sister grope her right out in the open.

Any minute your mother might call everyone to dinner, but the sexual tension in the room is overpowering as you and Elsie watch Fiona who is increasingly not even trying to hide what she's doing.