He thought for a while before replying, not sure he should be saying the truth, or anything at all. "Because I believe I was the one who disappointed you." He muttered finally. Not that he didn't expect it, not that he was supposed to do any different, still if he had to be coherent, he should have never seduced her in his bed.
Why had she agreed to it anyway?
"It can be. But there are lots of frustrating things about potions... when they don't depend on yourself but on what happens around you... or even simply on the weather..." he muttered, settling the roots back in the bag and closing it carefully.