"I'm Alisa, what's your name?" The female human, Alisa said
"I'm Alex," You said feeling and your member become erect, and move to hide it.
"Hiding it won't help you know, besides what's the point if we're both nude?" Alisa said
"Fair point, it's just that I find it odd that we're ass naked inside a giant chamber for who knows what." You said
"True, I can't even find a way out of here. I hope that something happens soon or else I'll be bored to death." Alisa said. Suddenly a pink gas began filling the room, and the two of you begin coughing inhaling it into your lungs. Suddenly you look at your hand and it seemed to be changing form somehow due to the gas. But before you could figure anything else your spine suddenly broke out in excruciating pain, and you passed out due to the pain.
You are becoming....
(Notes to consider: All regular animal transformations are anthro. I will create extra branches so that more types of transformations can be added please use them if needed. Also (f) means female tg for this branch.)