Sammi....

Just when you are wondering whether this arrangement might not work out as well for you as it definitely will for Jenna, you get a tap on your shoulder. "Hey stranger."
You turn to gaze on the lovely features of Sammi LeTourneau, and you smile. "Well if it isn't just the girl I was looking for." You give her a hug, which she reciprocates.
"I was worried my favorite dancing partner was going to be out of commission for good." she laughs, and you start casually dancing with her, keeping your steps simple.

"I'm not going to be throwing anyone in the air anytime soon, but I'm feeling alright." Her winning, almost mischievous smile has a whole new connotation now that you know about her crush on you.
"Boo... I like when you toss me around." She sticks her tongue out, and you enjoy some moderate dancing together for a while before she pulls you to a table for a rest. You can't help but admire her smooth skin. Her grey tank and black miniskirt leave her arms and midriff bare, and her shapely legs are as lovely as ever.
"So I met your sister-in-law last night. She seems pretty cool."
"Two nights in a row at the club...I don't know where you get the energy." You take a sip of water. You want to test the waters, but you don't want to freak her out. She doesn't know about...the arrangement.
"Good diet...and a passion for salsa." She points out into the crowd, and you follow her finger to see Jenna. She's dancing her ass off with Eric, rubbing her back and butt up and down his body to the beat of the music. "Your wife seems to have no trouble going two nights in a row, either."
"Yeah. Jenna does love dancing, and with Karen in town... you know they want to have as much fun as possible."
"Yeah...fun..." Sammi's watching Jenna intently. "She looks like she's having a lot of fun."
"Isn't that what the dance club is for, Sam?" You take her hand, and she looks at you in surprise. "You ready to get back to it?"
You find yourself back on the dance floor. Sammi has decided to mirror Jenna. She's grinding on you more intimately than she ever has before, rubbing her ass against your crotch and holding your head against her shoulder. You put your hands on her hips, and encourage her movements in a way that makes her hum with delight and surprise.
"You're...different." she says only loud enough for you to hear. "Normally...you'd be keeping me at arm's length."
"It's been....an interesting couple of days. Besides...you don't see Jenna complaining." A glance across the floor sees Jenna whispering in Eric's ear as they dance very close together.
"I guess not..."
As the song ends, Sammi turns to you. "I have to hit the powder room. Don't disappear on me?"
"I can't make any promises, Sammi..." you tease.
"I guess I'll have to piss fast, then." She sticks her tongue out, and you roll your eyes.