Yes

You don't want her to stay there, so you follow Sarah's advice, and put your hands on Riley's chest. It's almost completely flat, but you rub it as best you can. You're wondering if its going to work, when you see Riley trembling a little. Her twitches give you the confidence you need to keep going, especially when you see the strained smile on her face, telling you that you're not hurting her or anything, just tickling her.

Despite you tickling her as hard as you can, she doesn't start laughing, even though her breathing slowly becomes more labored. Eventually, she ducks her head down, and shakes for a few seconds, and you figure she's having more trouble holding it in. If you keep going, she'll probably start laughing out loud.

"St- stop..." she breathes "Just... give me a second." You frown, on the one hand, she seems to honestly expect you to stop while she recovers, so it might be mean to keep going, but on the other hand, she hasn't gotten off of you yet, and if you stop now, she might just stay there.