Hi. Over the weekend I visited a massage parlor where I received a happy ending. The masseuse did briefly kiss/lick the shaft of my penis only for a brief second, but it was unexpected/unprompted. She did use her saliva as lubricant and finished me on her breasts.
From these activities, what are my risks for any STDs/STIs?
Oral-to-genital contact only carries theoretical chances for herpes and syphilis, none for other STIs.
But herpes and syphilis transmission in your case, given just a brief contact, is unrealistic.
No worries there, you don't need testing.