Well I didn't exactly lived in the UAE but I lived in Saudi Arabia for 5 years and I definitely remember reading yaoi. Sorry that's the best answer I can give
I would be careful
"Internet users could end up being sentenced to jail for at least six months or pay a fine between 150,000 and 1 million dirhams if they are not cautious enough while surfing the web.
The Abu Dhabi judicial department has warned residents against visiting websites that feature inappropriate content such as child pornography reiterating that both users, as well as these websites, are constantly monitored by the local authority to ensure that UAE security is never undermined. The department said the UAE authority continue compile names of users of who visit these websites and document the date and time of the visits, according to Gulf News report."- https://www.google.com.vn/amp/s/mudawwana.com/jail-for-surfing-pornography-in-uae/amp/
In this particular case, you might be allowed since I'm not clear on what they consider illegal (this is fictional content afterall albeit certainly a lot of it is inappropriate) however it must also be noted this site is also pirating material. Keyword here is might.
When in doubt, it is better to use safe search engines such as Google. Asking it this way is very risky
vpn..or tor
anyone who knows if yaoi or accessing to yaoi materials prohibited here in UAE?