Currently in Paris and encountered this Rentmasseur ad “Nipple_artist”. https://rentmasseur.com/NIPPLE_ARTIST
Mark’s blog is all about “Balinese male tantric nipple massage resulting in multiple full body orgasams”. He goes into brilliant detail, describing how this occurs, in this blog page : https://www.massage-gay-paris.com/gay-tantric-massage-nipple-massage-description.htm
Were it not for an annoying case of COVID, I would be reporting a first hand experience instead of a blog post and Rentmasseur link.
Nevertheless if one is in Paris and so inclined, he might be the one to look up. At the very least, his blog is a turn on for those who enjoy or might enjoy nipple play !