Sensual Phrase/WMG

Yuki and Towa are secret lovers
They managed to keep their relationship a secret from everybody, including the band members. Yuki and Towa's relationship with women are just a cover. Check the anime:
 * Yuki lived with Towa in Towa's apartment for some time
 * They are always framed side by side, sometimes, really close to each other
 * They always leave together and go together in the same direction