Anything for Piya

Candace was the first to speak after Lawan at in the middle of the couch, sandwiched between Piya straddling my cock, riding and showing no interests in stoping and Dr. Candace Xi as she studiously tried to get her clothing back in order, covering her bulbous sensitive nipples and taking a sight to collect her breath, "Lawan, did you have fun on the substance?"

"I mean, before I knew what was going on it was a bit scary but after that it felt amazing to have that kind of lust and focus so pronounced in my body. It was like there was an urgency to feel... you know stuff." The glass pitcher that Lawan was chugging out of clinks against her pierced nipple as she tries to describe how it felt to have Woman's secret Helper splashed over her body.

Piya does not want to stop slowly driving her lean, long brown body on me, driving my cock in and out of her. Lawan throws a blanket over Piya and I saying "I can still see your butt but I don't think I can handle looking at that magnificent cock entering you again and again and again.

Was there something to talk about?" Lawan says, looking from her mid coitus sister the the buxom doctor because to explain.

"Lawan would you be willing to help you sister in a research project, well an experiment, really. To see if she can use the Woman's little helper to get herself pregnant?" Candace clinically explains.

"I'm going to be an Auntie? I'm going to spoil my neice like there is no tommorow. I'll do anything for my sister, any thing. What do you need?" Lawan says in her with, skimpy sleeping out fit threatening to expose something at any moment.

I can feel Piya's nails digging into my chest as her hips bounce up and down on my cock. Her brown skin contrasted with my lily white thighs as my rock hard cock pushes into her again and again not a meter away from the conversation as to what is going to come with this experiment planned.

"SO basically once a month you will be dosed just like you were earlier and you'll get to fuck me and Roo here."

"Oh, im absolutely in!" Lawan says with earnest zeal.

From my lap, trying to say this with her pussy walls gripping my shaft, Piya stops squeezing and releasing pressure as I'm inside her. "It wont be as easy as that, we'll be dosing you, testing your basel temperature and doing a few blood tests and then you get to fuck Roo and caddice is going to work her magic with her hands... but there has to be controls, there has to be rules because the goal here is to know if somehow you can help me. Either through blood transfusion or if there is something we can learn by doing this."

I can see Lawan playing with the hem of her shirt excitedly at the prospect, trying to position herself to see around the blanket she threw on us as she heres Candace and Piya talking about this experiment.

"So you'll get one week of dosing and tests right at the height of your cycle." Dr. XI explains and I can feel like I see Lawan trying to mentally change places with her older sister. Her pierced nipple becomes more pronounced. "Then Piya, can you find a way to make it back home around the height of your cycle and we'll do the same tests?"

"UhHHHH .... Yessssss" My girl friend hisses as she rides me before thinking about her new reality in Japan. "I mean it may not be for a whole week though."

The idea of limits of my time with Piya makes me sad but my cock is rock hard, deep inside her and my lust is boiling over at this point so I dont dwell on it. Instead I reach up and grab Piya's spot on her neck that drives her insane, pressing into it I pull her down into a kiss, feeling her moan into my mouth as Candace continues to explain the parameters of the test to Lawan, who is staring at me and Piya on the couch.

Dr. Candace Xi, for her part, is also periodically losing her train of thought watching but continues to power through as Piya is riding herself into a howling orgasm, the screams of which also interrupting Candace. "So that means for the rest of the month no heterosexual sex and umm... OH Fuck that's so hot... where was I? Right! No dick and um, you're going to have to get off the pill."

Lawan brushes that off absentmindedly "That's okay, most days I forget whether or not I even take them. Sometimes I'll have like 6 or so pills left over at the end of the month so I'll just take them all at once."

This stops Piya mid hip roll and she shoots a concerned look to her doctor friend and then a scolding look to her younger sister. "Lawan, they don't work like that. We've talked about this..." She starts

"Well it's a good thing I'm not going to be taking them for a couple months." Lawan says getting up. "So once a month, me and Roo here fuck with a doctor watching, then he does the same thing with you when you get home. Does he cum in me?" Lawan asks.

Candace and Piya both say "No!" at the same time, the **** of Piya's no makes her entire body seize up, her pussy gripping my cock hard.

"He'll need to cum as a sample" Candace explains, "I'll have tests I'll want to do on that too."

"Well is he going to cum in Piya?" Lawan asks. It seems like a very insightful question about the methodology of this new experiment, or its a sister enviously wanting what her sister gets.

"He'll be providing me a sample from their time together too." Dr. Xi answers

"But you're still going to be flooding my pussy with other loads." Piya whispers to me, directly in my ear that the other two can't hear.

The whole prospect has my cock twitching inside Piya's hot swollen love canal and I know I'm going to cum soon.

"Do you think you're up to it Lawan? You'd really be helping your sister out and we'll probably have a lot of fun along the way." Candace says, stepping close and putting a hand on Lawan's shoulder.

"I'd do anything for my sister. I just want one thing now."

Piya moans out, "Anything!" as she throws her head back, feeling my cock swelling and moving moments away from erupting.

"I want to taste his cum." the teenager says, pointing at me, causing the skimpy ultra thin white fabric of her sleep shirt to raise up and show her lower stomach.

It's all too much for me and I'm about to cum when I feel Piya's hands pushing off my chest and quickly dismounting from me, the blanket falls to the floor exposing my veiny, pussy sheened cock as its about to cum.

Piya doesn't waste a second as she wraps her lips around the head of my cock and twirling her tongue over the top of my cock, making me feel the **** of my own orgasm splashing into her mouth, underneath her tongue until I relax and am finished.

Candace is the closest to her so Piya stands up and kisses Dr. Xi. I watch Piya's tongue move into her friends mouth, pushing my cum into the doctors mouth who then turns and does the same for lawan.

Lawan rolls the cum around in her mouth, playing with it, exploring the feeling before she seems to realize she doesn't know what to do next. Her lips pinch tightly together and her cheeks bulge before she grabs the glass pitcher of water, empties it onto the floor and spits my cum into the pitcher. "Will that work as a sample?"

Dr. Xi, Piya and I all start laughing as Lawan holds the pitcher out with a straight arm.

"We'll get another one La," Piya says lovingly to her sister before her tone turns to one of hope "does this mean you'll do this?"

Lawan straightens her back up proudly, "Of course! I'd do anything for you, plus this sounds fun!"

"It's certainly not going to get us published anywhere, it may be the least scientific study I've ever been a part of but it'll definitely be fun."

"And it could work?" Piya implores her friend for some sense of optimism making her seem more exposed than I think I have ever seen her.

"It could." Candace assures her with a hug before they both go back to looking at the lab work Candace had brought over.