Kinda confusing slap

So I’m In class sit next to my crush we talk/joke/flirt all the time. He said I looked really good today etc. he did something new he put his hand on my thigh. We joke around a lot so I didt expect him to do it he says he’s gunna slap my thigh I think he’s joking but nope he slaps my thigh and leaves his hand there for a minute. It really stung and I never thought of being spanked would be pleasurable I mean this was my thigh not my ass but I started to think that if it was my ass I’d like it even more. I got a little hot and bothered by it am I strange? Btw we in high school