Hello Whenever I'm on my computer and leaning back in my chair reading an article my cat will jump up on my lap?

He is looking for some attention and loving. You are lucky he is not like our older Ocicat Saphira, who plants her cute fuzzy butt on my laptop keyboard and gives me "the stare", see the picture. OK, I complain a bit but I still love her to pieces! She and our other Oci girl Viola are the best behaved kitties ever to own us, going back over 40 years. They are just absolute joys!

it means that he loves you and he trusts you if he puts his butt in your face it means that he wants you to smell his butt cause that's how cats say hello and he wants to be your friend my cat would do this to me to sometimes its really cute when they do it :D or he just wants some attention hoped this helped C:

That's just how they show affection, he's saying he likes you.

He just wants some attention from you. Maybe try putting him a bit.