You begin to stroke Alex's former face and watch as your new, abnormally large cock rises up, but you quickly try to force it down with the palm of your hand as you hear someone approach.
"Hey, how are you guys doi-" Uncle Jack stops mid sentence as he sees your muscular, naked merman body sitting helplessly on the floor of his shop. "Nice choice." he proudly says, while looking around, "...Wheres Alex?" The realization that Alex may very well no longer exist rushes into your mind and unintentionally causes your penis to go flaccid as you begin to panic and stammer out words while pointing to your tail and genitals.
"You know he's not dead, right?" Your uncle tells you in a bored voice, as if this situation has happened before, "He's in the same place that people go when they disappear, he's fine." You look at your uncle with confusion on your face, then down at your tail. "...Well, mentally anyway," Jack says as he steps over your green tail and points to a door at the end of the shop. "There's a bathroom that way, head over there and I'll meet ya in a minute." He says while walking away.
"Uncle, about that..." you say as you flop your powerful, but useless tail, "I keep the floors clean!" your uncle shouts gleefully from across the shop as he rummages around, probably looking for something. "But I have no legs!" you shout with concern, "You have arms!" Your uncle shouts back. He was right, you did have an incredible set of arms, and a powerful upper body, surely those help merman around with land locomotion, right? You flop onto your front side, with your member slapping the cool hardwood floor as you shiver with excitement, then you start pulling yourself forward in an army crawl motion as your dick rubs between your heavy tail, and the smooth floor.
After several minutes of crawling and squirming, you finally make it into the small, surprisingly sterile bathroom, and flip your body into a sitting position as your scaled buttocks touch the tiles, a few moments later your Uncle walks in holding a hand puppet. "Put this on." he says as he tosses it onto your lap, you hesitantly put it over your hand and look at him as he slaps his forehead "John..." he says in genuine disappointment as you look around wildly "What?" you ask, confused, then you see your uncle point to your manhood. "Put it on that, and do your thing, and Alex will come back...trust me." You try to ignore the bad feeling you got as he spoke those last two words, and the absurdness of the situation as the door closes and you're left alone to pleasure yourself.
You put the puppet over your penis, and close your eyes as you begin to work your shaft, you imagine yourself lying on the beach as numerous mermaids drag their voluptuous bodies toward you, scenes of mermaids sucking you off, massaging your cock between their breasts and laying prone on top of you, belly to belly as they ride your massive member, lastly you imagine yourself taking a mermaid from behind as your thick cum fires out, and your whole body shakes. You open your eyes and see an unconscious merperson in the bathroom with you, laying face down a few feet away from you and that the puppet is gone, not only that but your dick is gone! You figure that by bringing Alex back all traces of his non costumed skin had to go with him, you rub the slight lump in the front of your tail that still houses your hefty testicles and look out at Alex, something's not quite right with him...