I’m fairly certain my cat is humping me.

He is a little over 1 yr old and is neutered but every time I have my arm just sticking out on my bed he’ll bite my hand and clench his booty cheeks like he’s humping it but I honestly can’t tell and I got back from a 2 week trip like 3 days ago and every time he jumps on me he’ll make biscuits on me and it looks like he’s doing the same thing clenching his booty cheeks. I got a video of it but you can barely see it in my pitch black room with the snap front flash so I won’t post it but pls help I feel violated😔