I like all three of them to have that awkward moment, but it's all up to Tamako, because it's her decision weather to have choose a harem, yuri or strait ending.
Oh and there is the "Prince" plot hole here as well.
Thinking though Mochizou's father may not approve of them since both families are mochi rivals, but that's life. Eventually I'll think both families will be united in making mochi.