http://www.mangago.me/read-manga/xxx_allergy/
That should be it
http://www.mangago.me/read-manga/secret_xxx/
maybe this one ?
I believe that is http://www.mangago.me/read-manga/xxx_allergy/ and there's a sequel to it too
I read a yaoi manga with the protagonist allergic to rabbits, I'm looking for it... can someone help me,please?