My lovely boy is 9 months old, nearly 10. He's neutered, he's very very needy ( which I don't mind of course ) and follows me room to room, always has to be with me, if I go to the toilet and shut the door he meows outside the door until I'm done etc and is ALWAYS sat on me.
In the last few days every time he jumps up and sits on me, his back legs were shaking and I thought he was just losing his balance and struggling to stay where he was until I realised he was HUMPING ME! He kneads on my stomach or my chest and just starts manically humping, what on Earth do I do? Yesterday when I got him off there was a wet patch on my tshirt 
please help! what do I do every time he does it? Tell him off? And what do I do long term to get him to stop? Thanks