"I'm lovin' it" The phrase doesn't quite fit with what is going on. McDonalds memes aside, I would say something along the lines of "it's so good".
Alternatively, you can go with the idea of them loving it and what someone would say. Would they like more? Do they want it deeper? Faster?
The phrase itself just doesn't work in this contex, or most other contexts, so try something else out. It is best used as a response when asked how someone is liking something
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