Well in-canon the series has been recently hinting at Amy and Sonic already being in some sort of relationship. Especially in the last 7 or so episodes and the Robots From The Sky Special (it hasnt aired in the US but I saw the French leaks). Thats i think as far as the writers can go before they get in trouble with SEGA. Though anyway im pretty sure Boom Amy and Sonic are a little past the "confess" thing. They are both pretty aware of the whole crush thing.
Probably for the best that they can’t fully show it, otherwise they’d have to show it going horribly wrong.