[Ivan]

Answering the three proposed questions:

1- Ray or gas are more unrealistic but provides easier and faster ways to devolve people than an injection (and I hate needles though XD). Also, a good idea could be adding different intensities to the ray so the subject could be transformed in a more or less ape-ish form.

2- About foot change it depends on how much you want the subject to be devolved. Personally I preffer human shaped feet with some changes as thicker nails or a lot of hair in the top but slightly monkey-like feet are a good option too.

3- Most of devolution stories are mainly focused in muscle growth, so maybe you can make a different approach focusing on hair growth or increased libido. Also, you can write about the feeling of being barefoot or even link that sensation to arousal.

Just take this as a recommendation, I'm a hughe fan of your work so I'm sure you'll write another masterpiece ^^