Zelda was laughing her head off while farting on herself... or to be more clear, it was the stinky Ultimate version constantly ripping ass on her Twilight Princess counterpart, who despite her outward appearance seemed to be really enjoying it. And with how she was doing it with her flatulence, the Temple was going to smell horrid for quite a long time!
"Oh yes, feel how hefty these poots are!" Ultimate Zelda giggled playfully while enjoying the brass music she was making with her steamy rear.
"Unf... I can't convey that I enjoy it, but I'm loving it...!" Brawl Zelda quietly said to herself, just taking in every fart gas blast with dignity as she didn't want to lose this.