More likely he's simply worried over strained feelings possibly popping up. He was feeding Tristan cupcakes the other night.
FILTER: You would be correct. There are four types - A, AB, B and O. It helps when people require extra blood, to know who is compatible to give. If you happen to be AB and she is O, we would know for sure that Aramis isn't the father.
I would apologize, if I thought you were actually offended. Porthos is quite good in bed, after all.