The Starlights (Seiya, Yaten, Taiki) and whoever
That Haruka and Michiru had decided to invite them of all people still rather astounded Taiki, as the logical part of the three Starlights. He'd dreamt things that made this seem all the stranger, things that may have also made him doubt how long this truce could last.
Yaten, on the other hand, simply didn't care. A party was a party, and an excuse to see just how drunk he could get Seiya. Sure, Haruka and Michiru had been rather explicit about behaving, but... he didn't really care.