This might be my favorite version of this trope. The knowing look from the future-self. The nervous confusion from the past-self.
There's another one that really pulls at my heartstrings. I a sad/happy kind of way. I'll see if I can find it and post it.
I'd hope that they're the minor in this situation and are imagining boning an adult and transed version of themselves. But if the Internet has taught me anything it's that I have way too much faith in it not to be creepy.
Unfortunately I'm sure my future self still won't have cat ears or a tail 😢. We're a long way off from that kind of genetic technology.