In all seriousness, try and track down a proper tantric goddess - it will be an earth mother type of older lady - and tell her honesty what you are looking to acheive and she will structure her session around that.
it will be as Explorer1 says, teaching you to get close to the edge and then how to stop before
.it may take you a few sessions, is more expensive than a normal massage but hey you get a HJ through in!!
Sorry I don't know one in HK but ended up doing a few sessions with Aleena when in Brisbane on business trips
http://tantrafantasy.com.au/male-multiples-mastery/ for a different objective
She genuinely taught me how to feel an orgasm without cumming or loosing rock - all though tensing and breathing techniques - fuck I need to remember how to do that again!!
Edit
Also try the Cock Hero section on pornhub.com
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Last edited by aurufc at 2-8-2017 16:35 ]