A hermaphroditic experiment

It took a day to clean up from the orgy. The next day you examined the potions that Lily left. There were some hermaphrodite potions. Two potions of humanoid transformation. And potions of permanence.

“My auntie Lexie took a hermaphrodite potion and a potion of permanence. It made her a hermaphrodite permanently. She now lives in the city with her two wives.” Brandy explained.

“I tried the hermaphrodite potion with Lily. It was really good. I think we should start there.” You explained.

“Yes, let’s grow cocks.” Marnie added excitedly. She grabbed one of the purple potions and gulped it down.

You and Brandy also took potions and drank them. You felt the now-familiar feeling from the other day. You watched your cock grow and become erect. You looked over to see Marnie had a dolphin-like cock protruding out of the scales that also hid her vulva, merfolk having internal testicles. Brandy had an equine cock and balls dangling between her back legs. At a glance, the cock looked smaller than Nessus, not that that mattered as it was still the biggest equipment in the room.

“Wow, this feels strange,” Marnie remarked, touching her cock as it twitched. “It’s so sensitive.”

“I can feel it swinging. I know why male centaurs have a sheath; this would get in the way. I don’t know how human men cope without one.”

“I would like to point out that they are not always erect and guys go to great lengths to protect their cocks and balls.” You added.

“Well, the only ‘great length’ I see is between Brandy’s legs.” Marnie joked, and you all started to laugh.

“I would also point out that they are functional and as we were taught in class, magic can have an effect on hormonal birth control so there is a chance we could impregnate each other with these.” You explained.

“It does.” Brandy remarked with a tone of concern regarding magic affecting birth control. “I must have slept through that lecture.”

“It does.” You confirmed. “But would that be a problem, this could be our chance to have biological children with each other, if you are ready for that. If not, we do still have some condoms left over.” You explained. “Of all sizes.” You added, looking at Brandy, who was giving the look of someone trying to imagine trying to get a humanoid condom on a centaur, let alone trying to do it herself.

“I’m game if you are. We are already mermarried.” Marnie replied using the term you hand come up with as an abbreviation of ‘married in the merfolk tradition’.

“I am ok with this. We do plan to be fully married soon before anything would start showing.” Brandy added.

“Well, let’s give it our best shot.” You replied. “We might only have one shot each, depending on the recovery times of these things.” You cupped your balls to emphasise your point. “I got to use this thing the other day, so Brandy, do you want to try your cock out on my pussy.” You said as you got onto your hands and knees and wiggled your ass towards her.

“Yes, I can do that.” Brandy replied. “Marnie, if you think you can hold on, mount on up. I want to feel what it’s like being fucked while I fuck.”

Marnie climbed up onto Brandy’s back. Holding around her waist, her tail over her ass. She lined her cock up with her pussy as Brandy lifted her tail to the side. Brandy got her front hooves on the bed over you it was similar than when she took you with the strap on. But with Marnie now joining in.

You felt Brandy’s cock press into your vagina. You moan as you feel it stretching you out. You reach down with one hand and find your cock. You begin to pump your cock as Brandy fucks you. It takes a few tries to find out what feels good. The strength of your grip, the pace, the technique. You had given hand jobs to guys before, but every guy was different and so are you.

“Oh this feels so good; I can feel every inch of your vagina.” Marnie cries from above you as she uses Brandy’s momentum to fuck her.

“Carrie, you are so tight. I am so impressed that you took the centaur guys, they are so much bigger than me. I can feel you squeezing this monster all over and it feels so good. I can feel myself pressing against your cervix.” Brandy moans. “Oh, Marnie, you are hitting the right places, deeper, harder if you can.” She instructed.

Marnie starts bucking her hips, actively fucking the centaur rather than just riding her.

“Oh yes that’s it. You’re going to make me cum.” Brandy moaned.

“Yes cum in me. Can you feel it in your balls. It feels so good.” You moan drawing on your past experience.

“Oh yes.” Marnie moaned. “I can feel that too. My pussy and my cock are about to explode!” She screamed.

“Oh yes, Marnie, Carrie It’s too much!” Brandy moaned and she reached her orgasm. Pumping cum deep inside of you as leaking femcum over Marnie’s cock.

“Oh yes!” You moaned as you felt Brandy cum inside you. It was more than Nessus had the other day. She may have the smaller cock, but her balls must be enhanced by the magic, as you felt your belly stretching as she filled it. “YESS!” You screamed as you came. Shooting cum onto a towel you had placed before taking the potion. You felt your pussy trying to squirt, but your urethra was forced shut by the horse cock in your vagina. You felt the walls of your vagina clamp and spasm around Brandy’s still cumming cock.

“Oh oh oh” Marnie moaned as she fucked Brandy’s slick vagina. “Yes” she gasped as she joined the two of you in orgasm. Cumming into Brandy as she squirted. She sprayed over your legs and Brandy’s with the typical mermaid gush.

You all lay on the bed recovering. Marnie’s cock had slipped back behind the scales. Brandy’s had retreated mostly into her sheath. Yours lay limp over your balls. “That was great,” Marnie spoke first.

“I wish I knew how long it might take before we can try again.” You replied.

“According to Google, while guys need an average of 30 mins to recover, hermaphrodites, natural or magic-induced, should be ready to go again in a few minutes. Google recommends foreplay activities can help get things going.” Brandy read off her phone, surprised that Google had an answer to such a sexual topic, but apparently it was a frequently asked question.

“Well, in that case, come here Carrie.” Marnie pulled you closer and got up on top of you. Her tail resting between your legs.

“Ow, ow, Marnie, your tail is squishing my balls.” You protested. “These things really are sensitive.

Marnie arched her tail above your cock and balls so as not to squish them. She leaned down into a kiss. You made out for a bit, her tongue entering your mouth. Then she scooted down a bit. You playfully nipped her tongue as it left your mouth. It then found it’s way down to one of your nipples. She began circling the rapidly hardening nipple with her tongue.

“Oh yer, that’s working.” You moaned. It apparently didn’t take much for your cock to begin hardening. It worked it’s way along Marnie’s smooth scales. Trying to find its way in.

“Oh.” Marnie moaned over your breast as she felt her own cock emerging from within her. “It really doesn’t take much.”

“You’re telling me.” Brandy said from the side. She was already fully erect from watching you make out. “Marnie, do you think your ass could take my monster?” She asked.

Before she could answer, your cock slipped into her folds, sliding along the base of her own shaft and into her vagina. “Oh.” You moaned as you felt your cock penetrating a woman once again.

“Oh, Brandy, I want to but I don’t know. You know where we keep the lube. Just use as much as you can and be slow and gentle.” Marnie instructed as you penetrated her. With her ass and pussy separated by the full thickness of her tail, it was hard to have a position where double penetration was possible or easy.

Brandy fetched the lube and had to bend quite a bit to reach down and apply it in copious amounts to the inside of Marnie’s ass, gently fingering her to start before adding more fingers and more lube. This caused Marnie to moan. “Carrie, if I come besides you too, could you get some on this monster?” She asked handing you the lube as you lay beneath Marnie.

You slowed your thrusts and got a good handful of lube. Looking past Marnie, you saw Brandy coming up on the side of the bed. She lifted a back hoof, giving you access to her cock. You ran your lubed-up hand along its length. It felt firm and warm, and you could feel a pulse in it as you ran down a vein. It twitched in your hand as Brandy moaned. She stepped away once most of the lube had been transferred. You resumed thrusting into Marnie, feeling her mercock wiggling over your chest.

Brandy’s hooves came down beside the two of you. You saw her undercarriage blocking your view, her head close to the ceiling. You felt Marnie shift as Brandy’s cock intruded her back passage.

“Oh gods.” Marnie moaned as she was entered from both sides. Her new cock rubbed between her belly and yours. Brandy went slowly at first, easing into her. She could only take half her length at most but it felt so good. Brandy agreed, moaning with each thrust. “Yes, take me, both of you. I want to feel you cum inside and fill me from both sides. Brandy, I want you to cum so hard it reaches my stomach. Carrie, I want you to cum with your magic cock and fill me with your babies.” It didn’t take long before the double penetration took her over the edge. “Oh yes cum with me!” she screamed as she reached orgasm. Cumming on your chest, squirting on your cock and her ass griped Brandy’s cock so hard she could not move it.

“Oh!” You squeaked as you came inside Marnie, shooting your cum as deep as it would go as your pussy squirted onto the sheets. Marnie had given you no chance to replace the towels, and most of them were in the wash anyway. It felt so good, the idea of cumming inside someone, potentially knocking them up. You began to realise that you had a bit of a breading kink.

“UUUUGGG!” Brandy grunted as she came into Marnie’s ass as it milked her sensitive new cock. She squirted from her pussy onto the floor.

After another moment to recover, you all decided you were spent for now. It used up a lot of energy doing thrusting motions you were not used to, even with strap-ons. Each orgasm also felt like two, one with your cock and one with your pussy.

“I, for one, very much enjoyed that but will be happy to let this monster go.” Brandy said. “Although it is good to see that we have enough potions to try this again, and I am sure we can get more off Lily if we ask nicely or offer to pay her.”

“I did enjoy that but my scale slit feels a bit crowded with both.” Marnie added.

“I think I am going to make this change permanent. If my fiancées don’t object.” You declared.

“No issues from me.” Marnie replied.

“You have yet to take my pussy, and I am interested to see what more you can do with it. Besides I will still be the herd leader once we are married because you're not a male centaur. If one of these potions changes that, then I might have a problem. We would have to propose all over again and build a new caravan.” Brandy replied.

“Ok then.” You replied. You got up and went over to the desk. You selected a Black a potion of permanence and drank it. It tasted like liquorice, but you didn’t feel any different after.

“Did it work?” Marnie asked.

“I guess we will find out when your cocks disappear, if mine doesn’t” You reply.

An hour went by and you watched as Brandy’s cock, in its sheath, and her large hanging balls shrank down to nothing. Marnie’s was internal, but she remarked how it felt like it just vanished, her insides feeling normal again. Your cock and balls persisted and were still there the next day. You had to wear your loosest panties and a skirt as you could not wear your normal denim trousers. You lamented the loss of half your wardrobe but took it as a sign for a well-deserved shopping trip with the girls.