Douwata is the semi-canon pairing between Doumeki and Watanuki from xxxholic and Tsubasa by CLAMP. Watanuki being the uke and Doumeki being the seme. Some evidence of Douwata include:
~Doumeki gave Watanuki half of his eye.
~Watanuki gave Doumeki his entire eye.
~Doumeki sat in the rain for 10 hours trying to find Watanuki.
~Watanuki gave Doumeki a ring.
~Yuuko said (jokingly?) that Doumeki was on the other end of Watanuki's red thread of fate.
Fangirl: Doumeki just kiss the idiot!!! Douwata forever!!!!
Fangirl2: I am tired of canon, CLAMP make douwata official already!!!!!!!!!!