He used the blood from the available wound to pretend to rape and take her virginity.

Base +5

Y'know, I have to ask: why are these two always paired together? They have zero chemistry: Ulquiorra is completely wooden and Orihime might a well be a pair of boobs on legs. It's not like this is OTP heresy to me; I don't care if one or the other is coupled up with someone else, it just baffles me why this particular pairing is so common. Aside from the brief master-slave relationship they really have nothing going on between them: you might as well have a plank of wood fucking a blow-up doll.

Base +4, Drax +8, Azura Meta +5, ssj4jw +7, rknaruto +9, Ginzaki +7, Spunks +8, Kn_Saber +7, krim1 +6, Ahmenhotep -7, UnknowDestroyer +5, Incest1234 +6, Fighnjaci +2, and 7 more...

Thats a crazy colorful cover

Base +7, Azura Meta +5, Incest1234 +6

And this children is what happens when doujinka are regular users of LSD.

Base +6, Incest1234 +6

@penislord1

I think it's just the angst factor that attracts people to this paring.
That a monster who should not feel anything or understand human emotions could come to feel something for Orihime.
That's my guess anyway.

Base +6, Incest1234 +6, satouame +5, Drax +8, rabidpandaren +1, yavi +6, NigwardotheFoolish +2

IIRC they did get some chemistry near the end, with Ulquiorra showing some emotions... which, considering how little character development most Bleach characters get, makes him way above average anyway :P

Base +49, Ahmenhotep +7, Incest1234 +6, shadowkazumanic +6, satouame +5, arenoss -8, rabidpandaren +1, Watermelon_Queen +6, Solardrius +7