Being asexual is having a normal functioning brain, just not one that is often portrayed. but yes it could also be, as we're about to find out, that it has nothing to do with sexuality.
Can't he just be, you know, asexual? There are people like that.
I wish he wasn't but I bet the asexuals are happy for the last chapters and he might be intentionally portrayed as such.
That doll will go two ways:
Ether it becomes a source of neverending Nightmares...
or (more probable) it becomes his protector (despite this not being that kind of Manga)
Remember what Yuuyi said in the before last page "I would be troubled too if..." meaning, he would be a bit inconvenienced, not that it would be hard, or impossible, he would be troubled, like anyone of us would be troubled when trying to cook without salt.
Reported for blurry pages...(or was it me?)
Also I loved Operas face when they got the order of Clara, it was like "I see, this is my life's mission now."