Assuming you are talking about Gaboon (Nigerian) ebony, you shouldn't have any problem with the pen or the finish. BLO will wear off fairly quickly, leaving behind the beautiful ebony. With regular use, the ebony will take on its own soft lustre, since it is a fairly oily wood. BTW, Skye, the heat produced by the application of BLO to CA is due to accelerating the curing of the CA.