I feel that if Suguru had to pick a girl, he would choose Yumi. Either that or he's trying to get closer to Yuuki. And if Yumi had to pick a guy, she would pair up with Suguru because he kind of fits the description of the perfect man she was telling Yuuki in OVA2.
It would be funny if Yuuki goes after Touko because shes almost the opposite of what Yuuki wants from a girl.
