Keep going

“Don't stop my sister's not home she'll leave in a minute. Keep on sucking me.” You tell Stephanie.

After no-one answers you think you hear Shelly walk away from the house. Relieved she takes you back into her mouth. She deep throats you. She works her lips up and down your shaft, licking at it with her tongue as she lets you fuck her mouth. You watch her working two fingers in and out of her pussy while she blows you. You can feel your orgasm building.

“You said I could come over you?” You ask her.

“Shower me in your cum. I want to feel it on me.” Stephanie answers.

You pull back and Stephanie reaches out and starts to jerk your shaft. You let out a loud groan and feel as you start to cum. Stephanie continues to jerk you aiming your cock at her breasts. You moan as you shoot burst after burst of cum over Stephanie's beautiful breasts. Your orgasm spent she leans into the couch gathering up some of your cum and swallowing it.

Stephanie smiles at you “Still going to fu...” She halts mid-sentence.

Distracted by your orgasm you both failed to notice that the two of you are not alone in the room. Stood watching the pair of you is Shelly. Shelly is your sister's closest and hottest friend. She is around 5'3, long shoulder length red hair and deep captivating green eyes. You've always paid attention to her luscious tight little heart shaped ass. She was wearing her school uniform knee high stockings, plaid skirt and an indecently tight white shirt. You can see her C cup breasts pressing against the material.

An embarrassed look crosses your face “This isn't what it looks like Shelly”.

“Well, she was sucking your cock and then you came on her breasts. I'm not really sure what else it could look like Dan.” Shelly responded sarcastically.

“Fuck it. Yeah, Stephanie was just showing me her negotiation skills and I was about to fuck her.” you respond honestly.

“So why are you stopping?” Shelley asked.

“What?” You respond.

“Well what I was watching was pretty hot. I didn't mean to intrude. I still want to watch you fuck her Dan. Why don't you get your money's worth. This sales girl is hot. I'll be honest Dan. I know you always check me out and Britney's brother so I've never really considered doing anything. If I'd realized you were packing that I would have reconsidered.” Shelly replied.

“Is she suggesting what I think she's suggesting?” Stephanie asked.

“I can answer that question easily....” Shelly lunged forward and kissed Stephanie fully on the lips. The sales girl was surprised at first but quickly embraced the teenager's deep embrace. You could fully your erection coming back to full strength as you watched the girls make out. Shelly broke off the kiss and started to lick your cum up off Stephanie's breasts.

“I'll tell you what Dan. You buy three full sets and I'll let you have a threesome with me and Shelly.”