James' sister

You lean up against the kitchen wall as you hear Jen opening the front door.

“Madison!” you hear Jen say in surprise.

You realize things are now becoming very interesting. Madison is James' older sister. She is two years older than James and yourself and a student at the local college. You have always lusted after her, but being your friend's sister, you have always considered her off-limits. Now though, having been balls deep in his girlfriend only moments ago, you think the stakes have changed.

You picture Madison for a moment, imagining all of the things you want to do to her. She is a petite brunette with jet black hair. She always wears it short. The thing you remember most about her was how built she is. She works out at the gym at least three times a week. Your fondest memory of her is her D-cup breasts and the tight tops she always wears with them.

The conversation between Madison and Jen snaps you back to reality.

“I was just about to get into the shower,” Jen lies.

“I didn't mind waiting. I came to get my black dress you borrowed last week,” Madison replies.

“Oh sure. I'll just go get it for you,” Jen answers.

You sneak a quick glance into the living room as Jen leads Madison into the room. You notice Madison's eyes being drawn to Jen's clothes which are still scattered around the sofa.

“Is my brother here?” Madison asks.

“No. I'm not seeing James today,” Jen replies nervously.

“It's fine if he is, Jen. I didn't mean to interrupt anything it's just that....” Madison says.

“Just what?” Jen asks.

You sneak a second look to see Madison pointing towards the sofa.

“Just that when I go for a shower, I don't usually get naked in the front room,” Madison states sarcastically.

“Oh. Yeah I just couldn't wait I was really sweaty after getting back from school,” Jen explains weakly.

“You don't need to be coy with me just because it's my brother, Jen. You're both eighteen. But this room really smells of sex. He doesn't need to hide just because his sister is here,” Madison tells her.

“No. Really ... James isn't here,” Jen stammers.

You decide now is the time to spice things up. You quickly and quietly strip out of your clothes and took a final look into the room. Both Madison and Jen have their backs to you. You stride into the room, approaching the two girls.

“No. Like Jen said, Madison. James isn't here,” you proclaim.

The look on Madison's face turns to anger and Jen looks like she is going to die from embarrassment. You are unsure if it is due to your nudity or due to the revelation she is not being faithful.

You can finally see Madison's outfit properly for the first time. The brunette is in a white mini skirt and a tight pink shirt. As always, her breasts strain against the material.

“John!” Madison exclaims.

“This isn't what you think, Madison,” Jen tries to reason.

“Not how it looks? My brother's best friend is naked in your front room, where you were also naked quite recently. I'm pretty certain this looks my brother's girlfriend cheating on him. Unless there is some other explanation,” Madison shouts.

You step behind Jen and attempt to hold her. She pushes you away slightly, still unsure what to do about Madison discovering your presence.

“I can't believe you'd cheat on my brother. He's always been good to you.” Madison points one finger at you threateningly. “And you are his best friend. How could you betray him like this?”

“It's not exactly like that,” Jen replies meekly.

“It's a little more complicated than you think Madison,” you state.

“I can't wait to hear this,” Madison retorts.

“Your brother's a great guy and all, but our sex life is horrible. He never makes me cum and only ever cares about getting himself off,” Jen explains.

Madison looks surprised at Jen's answer.

“Jen turned to me to help. Yeah, I know he's my best friend, but at least it's with someone he knows and not some random stranger,” you add.

Madison looks like she was starting to agree with the pair of you. “If there's one thing I hate, it's when a guy doesn't make a girl cum.”

Jen smiles at Madison's answer.

“He might be my brother, but he's a bastard if he doesn't treat you right, Jen. I'd dump a guy if he did that with me,” Madison states.

“You're not going to tell him?” Jen asks.

“Nope. I think it's pretty hot knowing his girlfriend is cheating on him with his best friend. I like knowing that he is getting what he deserves,” Madison answers.

You move from behind Jen and slipped around so you stand behind Madison. The pair of them seem uncertain at what you are doing. You reach round and cup Madison's breasts through her shirt. She squirms as you begin to caress them. She lets out a little moan, but attempts to push you away. As she does so, her hand lands on your cock. Instead of pushing you away, Madison finds herself stroking your length.

“John, you're huge. I never even suspected you were packing something like that,” Madison comments.

“He's a lot bigger than your brother,” Jen replies.

“I'm not sure I needed to know that part,” Madison quips.

You start to unbutton Madison's shirt and indicate to Jen to help you. Jen helps unbutton Madison's shirt. Your suspicions are right as Madison is not wearing a bra. Madison stops squirming and now freely massages your length.

“You know fucking his girlfriend is hot. But if you really want to give James some payback then fucking his sister and his girlfriend at the same time would be even hotter,” Madison comments.