Albus was terribly surprise, and yet not, when Elphias reciprocated. Either way, he was nothing but grateful-- and just a little awestruck. It never really ceased to amaze him, the potential of human kindness, of understanding, and the things love between two people might be able to overcome.
"No," Albus breathed, the word heavy and earnest. As for the rest, he knew he couldn't explain, not entirely. Sometimes the truth was a vibrant, clarion thing, that illuminated everything. And sometimes it only muddied things further. Albus knew far better than to trust the purely emotional desire to tell Elphias everything. When his temper thawed, saying too much would likely be something he'd regret. Too many potential consequences there were unclear. Besides, it would have been unfair to attempt to abdicate all responsibility. He was the one who was permissive with Gellert, believing that doses of indulgence staved off greater outbursts. Accountability for this fell on Albus as well, and he had no intention of denying that.
"Elphias, as sorry and repentant as I am, I am not asking for your forgiveness. How could I? I cannot conceive of anything more hurtful, more cruel that I might have said to you. I don't even know how to begin asking for you to forgive it, and I'm certain I haven't the right." It seemed to great a request, to ask that of Elphias. A very small sigh left Albus before he was speaking again, content to embrace Elphias as long as he would let him. "I simply couldn't tolerate you letting yourself believe a word of it. It was," how to word it, "poorly handled magic; it got far beyond my control, eliminated by ability to think and speak for my self. I couldn't stop myself from hurting you, and that was the intent-- not honesty."