What's that sound?

As Riley's voice comes down in volume, you hear the distinct sound of a car door closing. Maybe it was in a neighboring driveway, but you stop cold.
"You said Leah's out of town, right?" You look down at Riley.
"Yeah...supposed to be until..." you hear a faint sound... the fumbling of a set of keys.
"FUCK!" Riley whispers loudly, pushing you off. "You have to hide!"
You look around, spying the closet, and heading into it. Riley's frantically getting dressed. Suddenly, you remember that your shoes are sitting on the mat by the door. She's going to know there's a guy here.
The door opens, and Leah's voice rings out. "Riley?! Riley are you here, honey?"
"Yeah! I'm so sorry, sweetie..." Riley exits the room, but fails to push the door closed behind her. Fuck.
The voices are a bit muffled, but it's a small, one story house, so you can still hear.
"It's okay honey, I told you to make yourself at home. is everything okay at your house? did something happen...?" you miss some of the rest.
"No...no... everything's fine..."
"Riley, your face is flush....you're all swea....."
"Leah...I'm...."
Leah's laugh is boisterous. "Oh I get it... you needed to sneak away to have a little Matt time! You little slut, and on my bed, no less!" Her voice is full of laughter.
"Matt! You don't have to hide." Leah's voice is loud now, right at the door, and she takes in the bedroom, with your clothes strewn about. Is she putting it together that they are too big to be Matt's?
"Leah...honey..I'm sorry... I broke up with Matt. I didn't tell you." Riley is behind her now, and Leah's expression is puzzled.
"Then who...?"
"Leah, baby. Can I trust you?"
"Of course, Riley." her face is concerned as she turns to take Riley's hand."What's going on..?"
"Well... you know that deep dark fantasy I told you about...?"
Leah looks confused for a minute, until disbelief creeps onto her face. "Oh...my God, Riley... it isn't..." her hand goes to her face. You shudder in your hiding spot.
"...yeah...."
"He's....?"
"Yeah..."
"And you two are...?"
"Yeah..." Riley looks mortified and embarrassed. "I'm sorry."
Leah touches Riley's face. "It's okay, honey. I'm just shocked! That's crazy!" Her expression turns inquisitive... "How... how was it?"
"....really fucking hot..." Riley almost squeaks. "And...kind of got interrupted..."
"Wow... that's just... wow..." She looks around. "So where is he?"
No....
"Hiding."
"Oh, no..." Leah looks towards the closet, and smiles. "It's okay, Mr. Sinclair. You can come out. I promise, I'm not going to do anything, or freak out."
You grunt. "Um... I'm not exactly....uh decent." Interesting choice of words.
"I'm sure there's a towel in there somewhere."
You fumble around until you find one, and then nearly fall out of the closet as you wrap it around yourself.
"Wow." Leah sits down on the bed, and immediately shifts uncomfortably. It's probably warm, and a little sweat-soaked. "You're really there...which means.." she looks at Riley.
"Yeah. You can't...please don't..." Riley looks like she's going to bawl.
"Sweetie, I meant what I said. Your secret's safe with me." She rubs Riley's hand.

In all of the anxiety and fear you hadn't yet had a chance to properly take in Leah. She's grown since the last you saw her, becoming more womanly. She's very cute in her brown sundress and knee high boots, and her high cheekbones frame her winning smile as she looks you up and down.
"I'm so sorry we... on your bed, Leah. We'll get out of your hair."
"Oh, no..." Leah says. "Don't go! Riley, I've missed you so much, girl. And apparently, we have a lot to talk about!" She laughs.
"Ok, I'll just get going then. Probably better if we didn't leave together anyway."