Woah. Shou sure is having fun here... at our expenses. He's a master of tease. Better he gives us yuri at the end or I i will... probably cry and weep in a corner for weeks.
And everyone is gay for Ran.
There's no straight woman, just woman that haven't met Ran. (and Kana, from Wife and Wife, ofc).
By the way, I love how her words come back to bite Keiko's ass. Serves your well, Keiko, don't take Ran for granted! Seeing her all concerned (jealousy?) was cute.