If you were going to do that, you would have already.

[Considering how little Jon had trusted him to begin with when he arrived in Wyver and the level of his jealousy. Even before that though, he had willingly showed his abilities to Jon and worried little about how he would respond. He wasn't about to try and change his mind.]

I offer it anyway. We share a home and it would be safer for you to have something close at hand. As long as you leave me some, you can drink from me.