>>120522182
Because she's worst girl

>>120522182
>>120522507
Definitely worst girl.

Because wanting to fuck someone does not automatically make them relationship material.

>>120522182
Because he already has bigger cowtits.

http://exhentai.org/s/728734aefd/779117-9

Because crab is a fucking psycho who would brutally murder them both if he didn't.

>>120523166
>believing all the hot air crab spews

>>120523166
So she is allowed to have other men but he can't have other women? That's fucking bullshit

>>120522972
I still don't know what the fuck is going on in that doujin.

Because Araragi would never be able to convince Senho of a serious harem end.

>>120523333
Why not?

>>120522972
God fucking damn it Araragi.

http://exhentai.org/s/1102bdb118/779117-30

>>120523482
I want to say quads confirm but it is basically because Senjougahara doesn't let Araragi take it any further than "Fun" as she stated in Nise.

We can safely guess from that statement, she has issues with Araragi's dick being in other people which is a stance which would make getting a serious harem going nigh impossible.

Also he denied Cat, if he wanted a serious harem going, that would have been the prime starting point since Senjougahara has gone pretty dere at this point in time.

Because she is worst girl. At least Snake is somewhat entertaining.