<p>Well actually you can and I believe some people do...but...yeah that's weird. Yes it can, and we have seen that with Steven and Connie....whether they are ready for marriage (which they are not, they're kids, that would be wrong and there hasn't really been any real romance aide from crushing oneach oher yet) is another thing. On the matter of whether there relationship has been developed enough that they can understand each other....you might want to rewatch um every episode they are together, we see that this easily grows and strengthens, (to name a few specific episodes: Bubble Buddies, Lion 2: the Movie, An Indirect Kiss, Alone Together, Open Book, Full Disclosure, Sworn to the Sword, Steven's Birthday, Mindful Education, Rocknaldo, the New Crystal Gems, Gem Karaoke (the short), Kevin Party, Jungle Moon, Together Alone, Escapism, and Change Your Mind). They are definitely there by Kevin Party, maybe even by Mindful Education. (yes they do have their falling out for a few episodes in early Season 5, but they eventually talk about how they really feel and decide to stay jam buds.)
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