I don't think I flagged for a minute in the time we were waiting for Sarah to arrive. Katie went to the toilet at one point and I could help noticing that when she came back, the pubic wedge that had overlapped the ropes before was now perfectly lined up inside them. My girlfriend had evidently decided that if there was to be a show, it needed to be a good one.
As the minutes wore on, the confidence that had made Katie tidy her bush waned, and I felt myself growing nervous as well. Sure, I'd set this afternoon in motion, but it had gone so much further than I had ever expected. I thought about sensible, adult stuff like if my relationship with Katie and if both of our relationships with Sarah would be different after we displayed ourselves to her naked and post-coital. I also worried about childish stuff, like if she'd like the look of my dick, if it would compare to other men she'd been with, even if she'd laugh at me. A naked woman, especially one with Katie's body, had a kind of universal appeal, even to people not into girls. A naked man -- a surprise penis -- suddenly appearing in front of you tended to have more of a shock factor, even a funniness to it. Unless you're super ripped (and while I take care of myself, I certainly am not), men just don't get appreciated the same way.
A knock reverberated through the room. Katie answered, hiding behind the door and peeking around the side as she cracked it open. I thought it would have been hotter if she just pulled it over and showed her friend everything at once like she didn't give a damn about her tits, bush and cunt being ogled, but better this than flashing a neighbour, or an Uber Eats guy who got the wrong apartment.
"Oh my god!" Sarah's voice squeaked as she abruptly pushed through the opening. Katie, taken off-guard by her friend's eagerness, shrank away, holding an arm across her breasts and twisting her hips so her thigh concealed the vital core of her pubic area (if nothing else). "You're really doing it! I thought you were joking when I saw your message!" She was practically bouncing with excitement. "Stop being shy, lemme see."
Katie sighed and relaxed her posture. She was letting Sarah get a good, long look at her nipples and bush, not just the incidental glances they'd have picked up in the past. "It's a little silly, I know. I didn't think it'd go this far. If you want me to actually put something on I can..."
"No fucking way! You look so hot, I love the ropes. Give me a pose!"
Katie twisted to face me and raised one knee and both hands, doing kind of a Charlie's Angels thing. I appreciated the way her tits bounced from the momentum of the turn. When I managed to tear my eyes off them, I could see on her face that Sarah's enthusiasm was proving infectious and more importantly, she was enjoying this.
"That's great, now a sexy one," Sarah egged her on.
My wonderful girlfriend considered the request for a moment, then turned to face her best friend. She went to her knees, thighs apart, and arched her back a little, reaching both arms up to muss up her hair. There's something so exposing about raising your hands about your head when you're naked. Even if you weren't using them to cover yourself to begin with, the knowledge that they're so far away from the vulnerable points, that you wouldn't even feel the need to be ready to cover them, elevates the whole experience. Also, girls raising their arms up does magical things to their tits.
I couldn't see it from my vantage point on the couch, but I knew from the placement of Katie's legs that Sarah was getting her first real look at her best friend's pussy. It wouldn't quite be spread open, but there would be no hiding the engorged labia and protruding clit between the crotch ropes.
Katie flicked her head this way and the other, giving Sarah a few different angles and producing wonderful jiggles as she moved.
"Work it!" Sarah said, "work it, girl! Holy fuck you're sexy! Hey, do I get to take a photo?" She pulled her phone out, raising her eyebrows.
"Nooo!" Katie nearly fell over trying to get to a place to cover herself. "This is between us, Sarah. Between. Us. And Captain Perv over there. No pictures."
"Aw come on, you've helped me workshop my nudes," Sarah laughed. (This was news to me, and the implications made my dick twitch.) But she finally noticed me. "Hey, Captain Perv."
Her eyes met mine for a fraction of a second before they dropped to my waist. She stared, but she was grinning, so I felt like it was probably alright. After Katie's little show, I was at full mast and visibly throbbing, cock and balls all on display through the front of my pants. It might have been my eyes playing tricks on me (or just wishful thinking) but it looked like she was even starting to drool.
This was my girlfriend's best friend! A girl so off-limits I'd always stopped myself from even considering her. And now I was dick-out and hard in front of her, not just with Katie's blessing, but at her insistence. How were we going to look each other in the eye when next time we hung out? There was nothing I had left to hide from her.
"Hey, Sarah." I winked, making no effort to hide how happy I was with her reaction.
"Well isn't this a new side of you?" she asked, keeping her eyes shamelessly low. "Did I catch you in the middle of something?" She made a jerking off motion with her fist, even though the implication had been perfectly obvious without it. "I don't blame ya, with the view in here today."
"Not exactly, actually. Kat said as long as she was wearing what I laid out for her, my outfit was open pants so she could see my reaction. She's cool enough with you not to dress up..." Katie rolled her eyes, knowing I'd been the one to push her into being naked for Sarah "...so I didn't change my getup either."