Just don’t make a big deal about it. A simple ‘Thanks’, or, if you’re feeling really strongly about it, ‘Thanks so much’. That’s it, don’t go anywhere else with it or call it out with some special recognition. Unless it’s sexual favors, that’s cool too.
This, but even that can become weird some how. I have a friend who sometimes said I was handsome and I replied with a "thank you" every time, but one time did my friend feel it was enough and told me off by saying "you only say thanks!" I was unsure what to answer and said "well I don't believe it but I am thankful for you to think so" never got a "you are handsome" ever again after that xD
Unsure, she isn't really the kind to do such things. I never asked why.
Maybe I didn't seem happy or taking her words seriously. Maybe it felt pointless to compliment me or frustrating to give a compliment to someone who only says thanks all the time or all of them above?