Having sex with some mermaids was every child's dream as you saw that they were surrounding you to make sure that you wouldn't escape the progress they were making, as one took off your shorts while the other was busy with your penis. However as you were having your first time, you cum while passing out.
You were still conscious while the mermaids saw that the scales have almost completely covered your legs, and so they decided to take you somewhere safe to continue the orgy. While arriving at some kind of castle, and bringing you to a bedroom with beds that matched the same number of mermaids you saw, they then place you on one of their beds, to continue the orgy. As one got on top of your penis, as she placed it into her pussy, and then started penetrating you, while your legs start to merge.