Really? A book? Rose, a book is not going to help with this. Didn't you come to that realization already? Nope, only practice can help here. Lots of it, preferably daily until you both figure out what in the world you're doing.

Emboldened by the fact that Rose didn't push him away or seem to complain about his 'technique', John rubs his tongue up and down the side of Rose's.

Yeah, he still has no idea what he's supposed to be doing here. But at least an attempt is being made.