Go back outside and head to the farplane which is up the stairs. Rikku and Auron will stay behind. Also, here, Auron does something odd when you leave the far plane. Keep what he did in mind.
When you come back from the Farplane, the Brotherhood will have 3 new abiliteis. Seymour's father appears from the Farplane and drops something when is sent back because of Yuna. Yuna grabs it and runs.
Now this part is funny. Lulu and you have this converstaion about what Seymour asked, Lulu will ask you a tell you something. You have the choice of answering with "Too late...I already love Yuna" or "You're more my type, Lulu" or "Okay". Actually...what Lulu says about you picking her..."I'll add you to my list a admires" or something like that.
A man named Trommel will bring Yuna to Seymour's place. Remember...SAVE. Go to Seymour's place and enter the double purple doors. Later, Seymour will "talk" to Yuna and you can't hear them. After that, Yuna runs around and tells everyone that Seymour asked to marry her.
