"I rarely act in half-measures," Thor admitted, the words sounding like they were meant as an apology. Mayhap now was neither the time nor place for the gesture. "But see, you are not alone. I can be by your side, assisting you as you might need it. Though the chances for my brother's reform seem slim, if not outright impossible, I have faith in the good I see in him. He asked me," Thor stopped, thinking hard about how to say... if to even say something. Could it have been another ploy on his brother's part? Nay, he did not sense any deviousness at that point. Only naked sincerity brought about by a hopelessness.
"He asked me," Thor repeated slowly, "to ensure your well-being persists. He has the capacity to be a loving parent... I have seen it. Until and if Loki might return as one changed, let me be there for you. Think of me as..." not a surrogate, though that was essentialy his role. One did not simply abandon family, and Wanda Maximoff was now family in Thor's mind. That would do. Thor smiled. "As a brother."