the x-serum is my least favorite of the serums, I never use it on my family.
Good. That kind of thing is likely to land you in jail!
if we can same time in the future use it on my enemies that would be better.
Currently there are no "enemies" in the game. Yours, or the Player Character's.
There's a rival/arsehole who deep down wants to be a sexy slut that submits to both men and women, and there's a sadistic murderer who, like the Player Character, works for bad people doing bad things.
all so I do not like that I have to turn mom into the town slut before I can do anything more with her.
You don't have to turn her into the town slut. You can just leave her alone while you fuck around with half the women in the office, or you can force yourself on her after a couple of doses of the first two serums and high enough lust.
and can someone tell me what the cat collar dose?
Read the description you're given when you can ask about it in the sex shop.
If that's not enough, buy it and put it on the mother, since she's the only one you can put it on.