I'm already finished watching episode 10 (unsubbed). I felt numb after watching the last part T_T anyway, I would like to share you some of my theories after watching episode 10.

1.) After I have watched the part that Sousuke is saying something for the child (the child whom he always play with .. when the child was with her mom) I just realized that, maybe Sousuke was an abandoned child that's why he couldn't let go of Michiru and became too obsessed with her. He just wouldn't want to feel alone again. He's longing for an attention of a Mother and he wants someone to be there for him always.

2.) About Takeru, I remembered the scene wherein he's watching a Film with the couple kissing each other too intimate .. looks like Takeru can't stand watching it .. because of the too much physical contact of what he's watching .. Same goes with Takeru and Eri's scene .. wherein Eri's about to remove Takeru's clothes .. he showed a cold reaction to Eri right? I guess he's afraid of physical contact like that .. I think the reason behind that is maybe he's molested by her sister before. I'm not sure, but I think that's the reason .. the flashback scene of Takeru's childhood isn't that clear for me, but when I remembered those scenes .. somehow, I think it's the main reason for that .. why he's angry of her sister ..

3.) I think the wedding part couldn't be Ruka and Takeru .. I guess it's eri and ogurin

btw, Last Friends episode10 soft subs is now in veoh.com search "LF10"