Sisterly competition

Ashley takes a long drink from her bottle as Heather reaches for her purse at the foot of the couch. She fishes around a short while, then hands a pair of fifties to her sister.

"You win this one. He didn't go for it." Your eyebrow raises questioningly.

"Really? You didn't?" Ashley just talks around you as if you're not there. "I figured the two of you would still be fucking when I pulled up. Especially with his libido."

"Hey, it's not for lack of trying, you know!" Heather laughed as if she'd never seen your cock. "I was watching porn and went topless and he still didn't try anything."

"Sheez.... All it took for the last one was just the promise of your tits. But then again, your last girlfriend took even less."

"Okay," you interrupt, "what are you two talking about?" The two girls laugh at some private joke, then look at each other. Ashley finally explains.

"A few years back, Heather had a boyfriend that she thought was 'the one'. After he popped her cherry, she bet me a hundred bucks I couldn't seduce him. It took me about thirty minutes of dirty talk and touching before I had him. Ever since then, we've had a running bet when we have a boyfriend or girlfriend for a while, the other tries to seduce them. See just how loyal they really are. It's a lot of fun for us. And I've won a lot of money off her by it, too."

"Yeah, I thought I'd have it this time," Heather comments. Either she's chosen not to mention taking a cumshot from you, or blowjobs don't count in the bet. Either way, you're not going to mention that just yet.

Ashley drains her bottle. "God, I got so horny thinking about what you two might've been up to while I was at work, I had to excuse myself to go get myself off like three or four times." She leans in and kisses you gently, her hand resting on your thigh near your crotch. "I hope you're not mad. I'm sure I can make it up to you if you are, though."