Start out simple and slowly build up it as you build courage. Perhaps try
spanking his ass when he gets out of the shower, just once is enough at
first. Try pinching his nipples, easy at first but increasingly harder until it
really hurts. You may find you like the reaction you get, the feeling of power
you have. That may lead you to go deeper into this realm. Good luck.

i have a few suggestions for you. first lay him face up on your bed
first laying an old sheet below him tie wrists to his hips and ankles to
the corners then using a lot of rope criss cross it over him and under
the bed like lacing a shoe that way you can pull until it's really tight
and he can't move a muscle
things you'll need
latex gloves
nettles a sponge fake tennis ball
some string
3 foot length of cane
cocktail sticks
a basin of water
thick elastic bands
matches
candles not beeswax
birthday candles
nail polish
toothpaste
some condoms
tabasco sauce
a couple of good sized mirrors
riding crop

after he's secured to your bed get dressed in your sexiest clothes boots
stockings corset jewellery apply over the top make up

first wrap the bands round his hard cock then separate his balls so
they're nice and tight then straddle his face with your arse make
sure you position the mirrors so that you can see his face and revel in
his pain and suffering and of course he'll be able to see you
laughing and enjoying being sadistic
then put on your gloves and show him the nettles then start stinging
his cock and balls
have some wine at hand and cigarettes light up as you nonchalantly
cause him great pain

have a break and snort some coke then put toothpaste on his cock head
and wait and look at the agony on his face same with deep heat and
nail polish then produce your mace the ball with cocktail sticks
protruding attached to string attached to your cane and play it over
his cock then dip it in the water so it becomes heavier and repeat
then put the tabasco in a condom slip it on and wait then you can
drip candle wax onto him and finish by sticking a small candle into
his cock lighting it and wait for it to burn down till it reaches his bell
end