The two boys were sent to a cell with other kinds of aliens, all the aliens were just in their underwear.
A woman that had horse coarsed hair, a horsetail, the face of a horse and hooves instead of hands (but everything else was exactly like a normal human, just bigger and more muscular) comunicated with them in the same language.
"The slimegirls captured you too, right?"
"Slimegirls? They are girls? But they..." Jack questioned.
"How do you speak English?" asked Mike, perplexed.
"Well, I'm unaware of what English is but as we can understand each other I can only conclude that it is the same language as in my country, good thing," answered the horsegirl. She was just wearing black panties and co-ordinated toeless socks and bra. Another horsegirl joined them, dressed in a similar fasion. "Are you talking with these little hermaphroditic creatures?" she sentenced, pointing to the two kids.
"Hermo what?" asked both boys.
"Look at you; instead of hands you have men's feet, but down there you have women's feet, you must reproduce asexually" said the second horsegirl in an obnoxious tone.
"Brandy, stop! These are the only aliens that speak our language here, do not be your regular self" interrupted the first one.
"But Allissa, these beings are new to us, I need to know all from their race, for science..."
"Your science is what put us in this predicament to begin with!"
The two boys were still gathering their thoughts about how these eight feet tall muscular women were communicating with them in the same language while the other creatures just mumbled sounds to their similars.
"Ok... now answering your first question," said Allissa, "we named them slimegirls because they have breasts and feminine feet plus they had gooey jelly bodies."
"Makes sense to me" interrupted Mike.
"Yet, had you seen they have no toenails, nor genitals nor nipples? I think it is pretty uncertain to assume they are female at all," countered Brandy, "unlike you two, who have nipples, if it was not for your lack of breasts and the fact you have men's feet instead of hands."
"BUT WE DO HAVE HANDS, AND OUR FEET ARE NOT WOMANLY!" both boys yelled in anger.
"Brandy, I told you to stop. These maybe the only allies we will find. Stop making assumptions, they are just aliens." Allissa tried to calm down everyone, then took a seat and used her toes to point to her hooves. "For our race, these are hands, they are pretty useless except for fighting, pushing stuff or doing handstands so our feet can do stuff like holding objects, writing or cooking".
"In our planet we call them hooves," said Mike. "And we do not do stuff with our feet. Well, we walk with them and play soccer and that is all."
"Interesting, so... how do you weave if you do not use your feet at all?" asked Brandy.
"With our hands... which are like these" answered Jack while showing his hands.
"Wait, so your men's feet are your hands?" The boys didn't know how to react to Brandy's feet mumbo jumbo.
Brandy had been studing how they talked and emoted. "You are children, right? Excuse me, I thought you were adults capable of understand my scientific inquisitiveness. I must have sounded rude. My name is Brandy, and this is my sister Allissa. We need to escape from here and your petite size may help, combined with our bigger size"