I am looking for this manga that mostly revolves around this sex therapist of sorts who takes the form of the person that their customer likes. It was mostly filled with one shots of different couples and the only one I can remember vividly is the last one which involved a priest (probably) and this other guy who was a priest in training I think.

Thank you for your help!

You had the answer in your post all along! It's Sex Therapist.

oops haha, thank you so much!