Based on this drabble prompt from an Anon on Tumblr: "Can the Drabble be smutty? If so, can you do a smoaking canarrow orgasm denial where Oliver and Sara are teasing felicity? Please?"
If you've read "Friendly Competition" or chapters 14, 25 or 26 of "Drabblicity,"then you'll see that Felicity as the partner with the least control isn't how I imagine that relationship would work. So this is my best attempt at following the prompt. I'd say this would be happening early in the relationship. Not too long after "Friendly Competition."
Felicity is in Heaven. Though Sara and Oliver don't know that. They think they're torturing her, both working to bring her close to orgasm only to pull away just as she's about to lose control. She won't deny that they're succeeding at that. What they don't understand though is why precisely she enjoys when they do this.
It's not just their hands or their mouths or even Oliver's cock that she gets off on, it's that they're doing this together. She's always liked making them compete over her and this is the best version of that. They're trying to see who's the better lover. They take turns trying to see who can please her most, who knows her body better—all to win her affection over the other.
But they've never understood that she loves them equally—precisely because they're so different. She likes that Sara is rougher, more willing to tease Oliver and take action when they're all in bed together. She likes that within the the context of this...thing amongst the three of them, this is the only place where Oliver is willing to cede control, to follow and watch. She never knew he could be so gentle, so romantic. They complement each other and she knows that each wouldn't be as enjoyable without the other.
She could, of course, tell them that, smooth the conflict between them and make things a little easier on herself. But why would she? She's having too much fun.