LATER.
[That smile on Quatre's face almost made Trowa melt. He had never had the chance to see when he knew that Quatre liked him too and it was amazing. He wanted to see it more.
He just kind of sat there looking at Quatre until he asked that question. Yes, that was an important question. Did they want Duo to know? Especially after that]
We should wait. For bit.
[Duo would probably still find out, being in close proximity, but he was more comfortable with the idea of waiting and letting it play out a little more]