Will me and my cat's relationship get weaker (Long details inside)?

If I get another cat that is. I read someone else's answer and they said that they had a good relationship with their cat, but when they got another, their original cat started hanging with the new cat more often. My cat, Binnie, follows me everywhere in the house; sleeps on my lap when she wants to; sleeps in my bed right next or on top of me; we play various games such as fetch, hide and stalk, hide and attack, stand out in the open and attack lol; she cries if I leave for work w/o saying bye; so on and so forth. I've noticed her sleeping a LOT more than usual, although it could be because she's getting older. She's almost 10 mos. She is spayed and isn't declawed. I'm scheduled to pickup my new kitten, he'll be around 4 or 5 mos old, next month, Feb. I plan on doing the initial closing him off in the bathroom for 2 weeks and letting them smell each other and periodically letting him out and putting her in the bathroom, bla bla bla. Once they're use to each other, will she end up following him and not me or will they both follow me? I somewhat like the attention. Also will they sleep together somewhere else or will one or both sleep in my bed? Just questions that I've now realized. It's okay either way it goes but I really do like waking up and seeing her all stretched out on my bed like it's her bed and rolled over on her back with her arms and legs in the air. And I like watching her try, and always succeeding, to beat me down or up the stairs. It would be great if he turns out to be similar to her since they are of the same breed, Bengal, but then would I end up tripping and falling over one of them? haha