The motorcycle scene: Touga is obviously imitating Akio and failing miserably. Represents an attempt at achieving maturity and adulthood through adopting empty symbols of power. Gives the impression of movement and progress, but in reality is going in circles. It gets faster and faster, there's a sense of danger and agitation. Touga is driving and Saionji sits in the sidecar, they're not on the same level and Saionji disapproves. Seems like they're heading towards some destination, but they're going nowhere.
The bike scene: A reference to their shared memories. Represents clinging to the past and trying to return to the time of childhood. The wheels may be turning, but the bike stands in place. It get slower and slower as Touga gets more tired until he finally stops completely. There's a sense of nostalgia and emotional fatigue. Touga is the only one pedaling, but Saionji doesn't comment on it (meaning that perhaps Touga being in control wasn't the problem in the first place. Maybe it was always about wanting to restore their lost connection and equal footing). They're facing opposite directions, but at the same time leaning on each other.
Whatever the hell is wrong with Saionji's family situation is fully un-sibling-related so it doesn't get narrative focus but there is definitely Something. Dude is straight up homeless after getting expelled (and I'm pretty sure they didn't give his dorm back even when they un-expelled him) and spends the rest of the series alternately couch-surfing and camping. Where the FUCK are his parents.
thinking about rgu's assertion that it's a complete misunderstanding to think that touga doesn't care about nanami and saionji. he does care about them. he cares about them so much that he, someone who does not believe in sincerity or trust, is willing to emotionally beat down, manipulate, and abuse them to keep them close to him, to keep them on a short leash and that leash in his hand. because he absolutely cannot bear the thought that they can live without him.
So a good while ago I got a balloon sword and thought wouldn't it be funny If the duels were fought with balloon swords then I got serious about it
So besides the swords being balloons, the roses are too
The first idea in regards to this was the duelists using what is essentially a toy in battle, a childish imitation of a sword fight
The second had to do with empty desires, what motivates them to fight. They have swords, but they're filled with nothing but air, merely a shell to hold almost nothing at all
Coming to the roses I thought Anthys blowing up the balloons is in a way the inflation of the duelists desire and them then being molded into motivation to battle, folding the balloon into the form of a rose
It'd also make a very nice sound when the balloon is popped, literally exploding on their chests
I had imagined that around the black rose arc we could possibly switch over to real swords
Visually I Imagine the sword pulls of the arc as a balloon floating out of their chests on a string to then be exploded by the sword inside piercing the balloon
From then on out real swords would be used, the roses remain balloons
Not entirely sure what to do with the Sword of Dios, it could either be replaced by a real one once Utena gets hers pulled out of her chest, it stays a balloon sword forever or it only turns into a real sword in the very last episodes