If you liked
Ouran Koukou Host Club
|
...then you might like
Rockin'★Heaven
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The main male characters are actually incredibly similar in that they often mask what they are feeling and feel like they are being selfish. This only applies for the manga version of ouran though since the anime doesn't reveal all the detail's about Tamaki.
If you liked
Gravitation
|
...then you might like
Kyou kara Maou!
|
While these shows may seem rather different at first, they do have some very important similarities. I often recommend Kyou Kara Maou to friends of mine who are just starting to explore shonen-ai and find that it is a good way to ease them into the genre. Gravitation is an example of a show they might like to watch afterwards if they liked the relationship between the king and Wolfram. There are some similarities between the main couples in both these shows, though Gravitation is obviously more focused on romance. I feel that Kyou Kara Maou is quite possibly the most underrated anime that I have ever seen. If you like the shonen ai romance, but want a plot that focuses on other topics as well then this is a great show to get into. Besides, both shows have great music!