My Reasons
Well, my main reason they go so well together is because they are partners and they have a strong friendship with each other. When I first watched YuuHaku, I thought they were going to make a cute couple. I also noticed that Keiko thought Botan and Yusuke were going out and so did Kuwabara and Atsuko(Yusuke's mom, not me...). Of course, a girl hanging around with a guy a lot does seem pretty suspicious... Even if Botan's relationship with Yusuke will never be more than just friendship, I will always feel something when Botan is teasing him or anytime they interact...

But still, doesn't this couple make more sense then KuramaxBotan or HieixBotan? (ducks from fans of those couples) Botan interacts most with Yusuke or Koenma, yet she gets paired with some other hot guys in the anime that she's never even met before. I really hate it when people pair her up with every single guy character in the series. Hello people! BOTAN IS NOT YOUR SLUT! Botan's relationship with Kurama and Hiei are mearly acquaintences and a slight friendship. But with Yusuke, she's actually friends with him. Yes, she mostly discusses the cases with him, but they have their buddy moments, right? (Right?) She teases him about Keiko because she knows that they have something going on and wants them to get together so that they can be happy. What's that quote? I'm happy if the one I love is happy. Yeah...

Raphael's Reasons
It is definitely possible and is very likely to happen. There is a good potential that these two who'd have been together if not for Keiko being Yusuke's childhood friend and Yusuke caring and loving her. I am pretty sure that even though most people think that Botan only cares for Yusuke as a best friend and as a brother.

However, It is most likely possible that Botan is secretly in love with Yusuke all along, but the opportunity never presents itself. Botan was always there for Yusuke, and she was always helped him, not only from the missions, but his life. She was responsible for resurecting Yusuke back to life. She helped cheer Yusuke up and helped him on his love life. Like in certain situations when Yusuke and Keiko are together, Botan was always there hiding, like in the dark tournament near the tree where Keiko and Yusuke was talking, Botan was hiding in the bush the whole time.

Maybe, at first, Botan had a crush for Yusuke, then soon developed as best friends, then to the point where she loves him a lot and is very fond of him. She even created a bond much more powerful than the bond of Keiko to Yusuke where she knows when Yusuke died, it had a great impact and effect on her. She liked Yusuke, and knows him a lot, like she knows that even though Yusuke may seem arrogant, selfish, rude, a pervert, and with a tough guy attitude, that there is more of him than meets the eye. She knows that Yusuke is really compassionate, noble, kind-hearted, and loving. She knows that Yusuke just needs someone to love and take care of him. Botan was too late since Yusuke already thinks and realized about Keiko loving him.

I think that if Botan just told Yusuke about how she really feels about him and would show how she really feels like when she was always worried about him and when she cried a lot for him, much more that Keiko cried for Yusuke. I think that Yusuke would love and care for Botan, since Yusuke is the kind of guy who is very dense and cynical about things espacially feelings and love. If Botan would reveal her true feelings to Yusuke, then Yusuke would develop his love for her. (My fanfic would base on Botan's hidden feelings and how Yusuke develop feelings for her.)

An example about a good evidence that Botan revealed her feelings to Yusuke was when Yusuke lost the Makai tournament and was leaving to go to Raizen's grave and told him what happened. Koenma talked to Yusuke about his crazy idea about settling the three kingdoms from war by using a tournament to decide the future king of all of Makai. He was angry at Yusuke saying that he was complimenting him but lecturing him about his carelessness and stupidity, stating that what if his idea didn't work, Yusuke's respond was that he didn't know how to settle it and decided to host a tournament. If they did not agree then he did know how to work it out. Yusuke was still very cheerfull when he said this and he was even cheerful in the battle between him and Yomi, even at the fact that he lost and did not become the king. He bid goodbye to Koenma saying that they won't probably see each other again for a long time, then he smiled, waved goodbye, and walked off saying that he still has things to take care off in Makai. Koenma looked at him saying, "No matter what the situation is, he is still cheerful." With that remark, Botan stepped in and said, "Yeah, I know, that is why I really like him" (a bit of a pause) "He is an amazing guy." This remark is more than evident to say that Botan really likes Yusuke and even loves him in secrecy. Besides throughout the whole anime series, the only guy that Botan showed a lot of interest, feelings, and thoughts was Yusuke.

In my opinion, they would make a great couple and should have been together instead of Keiko and Yusuke.

If you would like to contribute some reasons why you think YuuBo works or is a cute couple, send them to : anime_gal36@yahoo.com.