Has Massues Gone Too Far?

I need to pick some brains here and get some honest feedback. My wife's friend is a masseuse and she's been going to Amy for years. She's tried for years to get me to go, so I finally broke down and went about a year ago.

Amy is fairly attractive, and seems super sweet. When I first started going nothing really seemed odd or our of the way. The closest thing, which I think is normal, is she will expose one butt cheek at a time and massage around the hip and buttocks. However, on about the 5th or 6th visit, she basically had both butt cheeks exposed and the top of the sheet was at the very bottom of my cheek. Each time, the sheet seems to have gotten lower and lower. The last time I'd guess the sheet was 4 inches below my butt cheeks, and my entire ass is exposed. I feel like my balls are also possibly exposed but rhe room is sort of dark, so they may not be. The last 2 massages, while my butt is completely uncovered, and would stand at the head of the table and run her hands down my back and butt cheeks, grabbing them firmly ans massaging them. She doesn't this several times. It feels exactly like what my wife does during sex.

She's not flirted with me in any way or come on to me, so it all.may be innocent . I have not told my wife.

Is this an innocent thing and I'm overthrowing it, or is there some element to her going a little too far?