Teri was having a lot of fun just watching and thought it was time to reveal, but she wanted to create a situation first for when she showed up. She then wished that Alice would become a hermaphrodite and that she herself should not notice the change before someone pointed it out to her.
As desired, a large equine cock grew between Alice's hind legs, accompanied by a ballsack containing a pair of balls the size of coconuts, all without her noticing anything.
"That was fine, but now we have to find a way to get out of here and try to get back home." Louise said
"First we have to try to get back to normal, it will be a problem if we appear to have a horse body as our lower half." Alice said
"I know, but we're going to give it a whirl. Also our families and friends must be worried and it is better for them to see us even though we are not fully human than to have no news about us." Louise said
"You are right. So we better go, if we can't find a way out then we'll have to find water and something to eat. I can be part horse now I don't even care about eating grass." Alice said
The two centauresses got up then and started walking without either of them having noticed Alice's cock. Having a map of the island in her memory, Teri knew where they would end up if they kept going in that direction and thought it would be a great change of scenery. She followed them for a short time until they came to a small clearing where a stream ran in the middle.
"Great, I was already very thirsty." Louise said and trotted to the edge of the stream, and her friend followed close behind, stopping right beside her.
"I'm thirsty too." Alice said and so the two of them arched their front legs to be able to drink from the stream water.
While drinking, Louise noticed a strange movement under Alice in her peripheral vision and looked to see what it was, finding something long under her friend. Her first thought was that there was a snake in that direction that must be on the other side, but her friend finished drinking the water and standing up and with the new angle she saw that it was a dick, which was hard.
"What was it Louise? From the way you look at me, it seems like you've only just realized that I've become a centauress." Alice said
"It's not that. It's just that I hadn't realized before that you had grown a dick." Louise said
"I didn't say why it didn't happen. I'm still a girl and I don't have a dick." Alice said
"Yes, you have. I can see it very well from here." Louise said
"You must be kidding." Alice said, moving her muscles from what would normally be a horse's neck to look between her front legs and find the male member pointing straight at her face. "It can't be, don't I really have a dick? But since when has this been there? When we had our moment before I'm pretty sure I hadn't it."
"How did you not notice? Look how stiff you are, there's no way this isn't bothering you." Louise said
"I had noticed something there, but I thought it was something that had stuck together when I lay next to him before and was going to wash myself in the water after quenching my thirst." Alice said
"I get it. You've never had a dick before so you didn't know how it feels to have one." Louise said, looking once more at her friend's new member.
"Hey, don't stare so hard. I'm ashamed of you doing this." Alice said, but her dick pulsed
"I'm sorry, that was not my intention. But look how hard you are and with your dick throbbing like this, you must be very horny." Louise said
Alice blushed and said "It's true, I'm horny. But we just did that a few minutes ago, if I said I was still horny I would sound like a slut, something and I'm not." Alice said
"That's not what I meant. What I mean is that I somehow liked it. Oh what a shame, I can't believe I'm wanting you to fuck me." Louise said
Alice then passed her front legs over her friend's horse part, positioning herself behind her and saying " I also want to have a nice time with you again. Now that I have a dick I want to use it on you.
Louise just moved her tail to the side, clearing the way and saying "I'm all yours." thus removing the blouse and bra she still wore and massaging her own breasts. Alice also took off all the rest of the clothes she still wore and threw it aside while looking for her friend's pussy, pushing and penetrating as soon as she found it.
This was the time Teri was sighing to reveal her presence. Instead of just stepping out from behind the bush she was hiding in, she decided to act, pretending to be lost and very surprised too. She took advantage of having given herself the ability to switch between the two forms as she saw fit, so she changed into her centauress form, but in such a way that the two French friends who were having sex became aware of her presence as she transformed.
"Alice, stop please. There's someone else here. We've been seen." Louise said after seeing Teri become visible while transforming from behind the bush.
"I can't, it's too late. I feel like something is going to explode inside of me, I think I'm going to come" Alice said and, burying all her masculinity in her friend, stopped there and came.
"Please don't look at us now." Louise said uselessly to Teri as she reached her own orgasm too.
Teri waited for the French centauresses to recover from their orgasms "I'm sorry, that wasn't my intention. I've been wandering through the woods alone after I came here all of a sudden. I heard some voices and followed them, only to find you having sex."
"Oh, what a shame, you saw it all." Alice and Louise said together covering their flushed faces, but deep down they liked it a little and it was easier to see through Alice's dick, which hasn't even finished softening and has already hardened again.
"No problem. I was just surprised to find out that centaurs actually exist on this island and I didn't mean to bother you, but that's when I started turning into a centauress." Teri lied
"But we are not centaurs naturally, we were normal girls and we went through the same transformation as you just a few minutes ago." Alice said
"She is telling the truth. But, did I not hear correctly or did you say that we are on an island?" Louise said
"You didn't hear wrong. I'm good at climbing trees and I climbed a very high one that I found to try to find a way out of the forest, but from up there I could see that out of this forest, beaches train in all directions and we are surrounded by the ocean." Teri lied