As in Tantric Yoga, Tantric Massage seeks the same goal: Heightened, focused erotic energy, but special attention is brought to bear with direct stimulation to the genitals; the erection is sought and maintained.
If your partner has a full erection, run your hands under it to move to the opposite side.
As each spasm gathers use an upward stroke along the shaft to help the spurt move through and out the cock.
Continue to slowly and gently stroke the cock and massage the balls
Then you will cover him with a sheetand then move away. Allow him to relax for a short while, then help him to sit. Perhaps hand him a bottle of water (always a good idea after a massage). Ask if he needs assistance standing to dress...if so, help steady him until he has his balance.
This has been a long post (and late), but I hope it was worth it. Find a massage partner to swap with every month or so. It will do you a world of good - mentally and physically.