I'd argue that with the quality of the writing, it actually makes the amount believable. That close of a connection coupled with that long of separation mixed with extra anxiety of being from a powerful family that is used to people they care about being in danger? Plus magic that can turn on your partner discreetly from anywhere in the room? We're lucky they do anything else in a day. It's only been a few weeks since the four reunited after all. Even less that they started actually pursuing their feelings.