Just sex, so she gives you more.

"To be honest, I really want to fuck you," you say.
"Sounds good. I do have to say, I'm a bit surprised by you though," Miranda says.
"How so?"
"Well, to be honest, I thought you were going to say something bigger and, well, dirtier, John."
"Oh. I didn't even think of that- I just want you."
"Awwww, how sweet. For that- and saving Nicole-, I'll let you do something more...in a bit."

She takes off any remaining clothes she may have on and you do the same. No sense of shame or playing the game right now. Your long-time crush mounts you again and rubs her pussy against your dick from the back. She's teasing you and warming herself up a little.

"You must realize, of course, that even though you didn't ask for it, you're getting at least a threesome with me and Sarah right?"
"I did not, but I'll certainly not say 'no' to it."
"You're cute."

She leans in to kiss you, her 36C tits pressing against you as her pussy rubs your dick even more as it is pressed down.

She gets back into position when she's done and grabs your cock playfully, giving it a tug or two.

"For saving my friend, you get this..."

She gets up a little and guides your cock into her pussy. It is very wet and entry is easy at this point.

"...and for being so cute and innocent, you get this."

She gets up higher and your cock pops free of her pussy. You are confused for the moment, but let this play out.

Miranda guides your cock somewhere else as she lowers herself again- into her asshole! It is tight as hell!

"Holy shit," you say.

Nicole and Sarah glance over to see what is going on. Even Matt takes a peek, before his face is pushed back into pussy.

"I'm a dirty slut and proud of it," Miranda says, "I love turning nice, innocent guys like you into my playthings. Just lay there and let me fuck you."