WillTylor,
I wanted to post a suggestion as to how I've fantasized about the truth or dare sequence continuing. What if Mandy lets Lauren borrow her phone for a quick minute (send a quick text to Ryan but can't find her own phone). When she searches for Ryan, she finds a picture of herself asleep with a penis mustache with what is clearly Ryan's dick. She doesn't say anything to Mandy right away. Instead, the next time Lauren and Ryan have sex, she asks about the pic.
Ryan explains that, because she keeps falling asleep as they are starting the truth or dare game, they've been using Lauren's body as part of their dares. Ryan explains that they end with either a Mandy handjob or using Lauren's thighs for a thigh job. Lauren is outraged! "What!? She doesn't even give you a blowjob?!" Lauren immediately wants revenge on Mandy by forcing Mandy to put out for Ryan.
Ryan explains that he suspects that Mandy is secretly attracted to Lauren as well as himself. Lauren then decides to turn the tables on Mandy. She confesses that she's also secretly attracted to Mandy and asks if that turns Ryan on. When he confesses that it does (or his dick confirms that it does) she suggests a cunning plan.
Ryan is to let Mandy suggests that they take things further. Ryan somehow is supposed to let Mandy suggest that Ryan actually fuck Lauren while she's asleep. After a round or two of straight fucking, Lauren suggests that Ryan figure out a way to get Mandy to dare Ryan to fuck Lauren in the ass. Lauren notes that this is a perfect way for her butt to get used to Ryan's size without pain, and then after a few sleeping practice rounds they can both enjoy the fruits of anal sex.
But here's the twist. After Ryan's fucked Lauren's ass while she's asleep, at Mandy's instigation, Lauren will "discover" the pictures of Mandy's perfidy on Mandy's phone and confront her. Mandy, caught, will allow that Lauren gets to chose whatever punishment she sees fit. Lauren will say turnabout is fair play and that Mandy has to do everything with Ryan that Mandy convinced Ryan to do with Lauren. Only Mandy has to be awake for each step and Lauren gets to promote/participate in every step. Both of them will be hugely turned on by this proposal and Mandy will agree, though she's afraid of Ryan's dick up any of her orifices, especially taking it up the ass. But she agrees for the sake of family harmony (and because she was so immensely turned on when watching Ryan fuck Lauren's ass).
This scheme hits on so many fetishes - sleep sex (consensual, since Lauren agrees ahead of time), anal sex, coercion, furthers the lesbian theme between Lauren and Mandy to the point that Lauren ends up making out with Mandy to help turn her on while Ryan works his dick up her ass, etc.
Just a little fanfic suggestion that I pray makes it into the game!!