Blow job additions?

use some daves insanity sauce on his schloong, this is hot... beware of getting his load in your eyes because it will probably hurt with this on it .

fondling the balls is a good, low impact treat.
In addition, you can massage the prostate by firm pressure on the area immediately behind the scrotum (t'ain't). If you are really looking to make his life interesting, slip a lubed finger up his ass and stimulate the prostate directly.

a lot of it is psychology. Act like you love doing it.
Try showing him the come on your tongue.

when I want to spice up a bj for my guy I find that different sensations drive him wild, specially hot and cold - ice chips work great followed by a warm tongue or a sip of tea... some of my gfs swear by fizzy drinks and pop rocks but I'm yet to try it out ... I think the best thing you can do is show how into it you are, tease a lot and don't neglect his whole groin region thighs, testies etc because its all very sensitive.. and if you want to hieghten the feeling try blind folding him..not be able to see what your doing doubles the anticipation of what/where/how ur gonna touch him next.