I think it was an exo fanfic with the pairing of Luhan and Sehun. I just remember one specific scene. In one chapter, Luhan, Sehun, and I think Luhan's brother are at a amusement park. Luhan and Sehun I think were alreasy dating or married. Luhan kept putting off riding the rollercoster (this was due to him being pregnant and not telling anyone about it, including Sehun), and that in turn made Luhan's brother mad or Sehun mad. The reason the  brother was probs mad was because he was visiting and it seemed like Luhan was being a party pooper or Sehun was mad BC he was just being an arse. I vaugly remember, but I think Luhan's brother also kind of infatuated with Sehun.

I'd really appreciate it if anyone could point me in the right direction or give me title. Thanks! ❤