My read on this is that it was a quick and impersonal hookup with the only goal essentially being a quickie during lunch to get their rocks off.
I get how a lot of captions and fantasies out there are about being objectified, used, and “thrown away”, but I’m of the belief that foreplay and teasing needed if you truly want to enjoy yourself.
Give it another try but instead of a quick blowjob during a lunch break where you immediately get on your knees, how about some clothed kissing and teasing before you ultimately get on your knees and service the cock.
Your body is made in the kitchen. If you can, see if you’re able to go to a Nutritionist or Dietician and build out a plan to achieve your goals. This will get you at least 80% of the way if you can maintain the strict diet. Unless they’re kink informed or whatever just say that you want to slim down and lower your body fat to be slender but not be super ripped or anything.