
I find the first two panels cute...
http://www.mangago.zone/read-manga/kuroshitsuji/an/kuroshitsuji/103/pg-16/

Hey, I think that Ciel and Finny (the gardener) knew each other before.
http://www.mangago.zone/read-manga/kuroshitsuji/an/v18/c090/1.html/pg-16/
By referring from here, we know that someone was there with him, and for some reason, he only let Finny touch him when Ciel was kind of going crazy?? Also, there is some hint that something related to Finny is going to happen by this page ->
http://www.mangago.zone/read-manga/kuroshitsuji/an/v18/c087/1.html/pg-6/ & http://www.mangago.zone/read-manga/kuroshitsuji/an/v18/c087/1.html/pg-7/

I dont think that it since it was said that all the children that where with Ciel at that time were killed, Ciel said that they could not be saved after what they had gone thru and could not recover.
As for why he allowed only Finny touch him i think its because of Ciels trauma of adults, he was scared of then as a cause of his experience while being help captive and since Finny is still young and cant be considered and adult Ciel felt safe and comfortable around him more than anyone at the time and could tolerate his presence.
About Finny knowing German i cant be sure (i dont remeber correctly) but that's because of where he was being held prisoner and was experimented on was a German institution

Now that you mention it, whose hand is that? I thougt it was anothersideofCiel's or something like that
I really like it. "because she heard the voice."