Pleasure from Being Served

I'm hoping for some input on something that has been happening for me for years now. Since high school, like when I was 15 or 16, whenever I watched someone do something for me, I felt a weird pleasurable sensation going throughout my body. I'm 21 now, and that has never changed.

I'm bringing this to attention now because it has been a while since it happened. In one of my practical classes, I was struggling with something on my computer, and called the teacher over. I let him sit in my chair and he started doing that part of my work for me. And the sensation, it starts from my spine, to my head,, then settles in my gut before spreading through my entire body. I've never been able to understand it, and it gets me feeling drunk every time.

How it used to happen was, for example, in high school, I'd get one of my classmates to clean up a mess for me., and when I watch them do it, I'd get the exact same sensation.

So I'm wondering if you've ever heard of anything similar, or if this might have something to do with hierarchy?