With a grin Maddi wastes no time and trots behind them and makes you mount them. She slides your horsecock deep within their shared folds of their now merged and shared rear pussy, causing both of them to gasp and nearly crumple to the ground as both of them nearly passed out from the sudden sex.
"Hehe, well this is interesting. It turns out that since they tied, some part of the losing portion of the bet also was applied to them, meaning that now both girls were extremely aware of their shared lower half. Actually, it seems almost as if their lower body is their main body, and their merged human torsos are just a portion of themselves, like an arm or a leg is. Meaning that this shared pussy likely was their core selves."
This hypothesis is proven correct by Liz's and Amanda's blissful mutterings while they are both completely absorbed by the pleasure of being mounted and fucked. "Oh my god, slide that dick inside me farther.... oh yeah, stuff it inside of me more!... Go faster!... This precum tastes amazing.... I can't stop myself from clamping down more and more on this amazing cock...."
If Maddi had to guess, the two of them are now their shared, rear facing, pussy, but they also had access to their full range of senses made available by the rest of their merged body. But this would explain why they bairly seem to be holding themselves together, and speaking as if they each are their own shared pussy.
"Hey Alex, how does their mare pussy feel?" Asks Maddi. You are also in a similar state as Liz and Amanda, given that your "self" is split to be located both as Maddi's cock and front pussy. So while it only felt like half of you was truly inside of them, it is more than enough stimulation to make thinking somewhat of a challenge for you at the moment. But you manage to squeeze out 4 words, "Pussy feels... so good!"
Maddi continues fucking the two of them for a few more minutes until she and Alex accidentally cum inside of them. "Woops, uh... sorry. I can fix that though. I bet that whoever cannot say a number outloud will become pregnant with mine and Alex's last load of cum" declares Maddi. The 4 of them all say a number outloud, ensuring that Liz and Amanda do not become pregnant. And since no one here lost the bet, the massive load of horse cum that was deep inside of the merged girl's shared mare pussy vanishes completely.
"Aww, and here I was, kind of liking the idea of being packed full of hot, thick, horse jizz" jokes Liz. "Yeah, but she made the right call. We shouldn't end up pregnant just because we both like the feeling of being full of it. Maybe if we buy a horse sized condom or after we get spayed, if we wanted to, then we could do that. But I do not feel like carrying and then birthing a foal anytime soon" points out Amanda.
"Well, anyways. Have either of you two noticed that you both are speaking as of you are just the shared pussy on your body?" Askes Maddi.
"Now that you mention it..." says liz.
"Yeah, I hadn't realized it either, but your absolutely right. Huh... Hey Liz, you wouldn't by chance feel as if you basically are just a pussy, but with connections to the rest of our body right?"
"That describes how I feel perfectly actually."
You now speaks up. "So wait, the two of you are basically now the same pussy?"
"Seems like it. But we each still control our own heads. However everything else I guess is shared. I seem to be always in sync with moving the right body parts with Liz. So like, if I want to move our right arm, we both move it together at the same time, as if we are just one consciousness. But if I want to stick out my tongue..."
Liz then takes over and continues the conversation while Amanda's head sticks out her tongue, "then I do not feel anything about that. Our heads belong to ourselves, and I guess so does each of our respective front pussies, except for some reason, I feel that my pussy is located on the opposite side from my half of our body. Amanda also feels the same way, I can tell because our thoughts are somewhat linked together now too. It is kind of weird, but cool at the same time."
"Yeah, that makes a ton of sense. I sometimes feel that way with Alex too. Like, I just know what he is thinking without either of us saying anything." Agrees Maddi.
Amanda is the next one to speak. "I want to make another bet. If we beat you in a race to that tree over there and back, then you will become a full futanari centaur, but Alex will become just your horsecock, balls, and mare pussy. He will still be able to fully communicate with all of us though. And if you win..." Amanda gestures for Maddi to provide your team's penalty for Liz and Amanda.
"If we win" begins Maddi, "then you grow a huge horsecock and balls like we have, and mount us, cum inside of us, and immediatly cancel any unwanted pregnancies that come from it."
"That's it? There isn't really any downside to that for us though..." points out Liz.
"Fine, then you also will only be able to graze and swallow cum for food, and your breasts will produce so much milk that you will need twice daily milkings to empty them." You pause for a second then add, "also, you cannot milk yourselves, and will need either a machine, or someone else, to milk you." Maddi smiles at your suggestion, and both Liz and Amanda are also grinning, albeit slightly nervously, but more than anything in excitement.