If I may let me share some advice
An rp is basically a form of storytelling; and to really be invested in that story, there are certain aspects to be set up that your character needs to react to.
In this case, we're working with classic Sonic being unable to get home, right?
Well--what's the initial feeling?--Dread, Panic? What was it like when he face-planted against the floor when the portal rejected him?
What about the portal itself?
How does the whole 'party atmosphere' diminish from that? Abruptly? How do you open up a way for your partner to likewise respond to that?
It's basically about building up half a foundation that can keep going without becoming one-sided and stale, ya know?
Just give it your best shot to be as descriptive as ya can without waffling too much or trying to hammer in one obvious point