Ah! Very funny. The looks on all three faces! Four, counting the owl's mirth. I love the details and the composition, and the angle you chose to draw it from. The way the lube (?) in Severus's hand appears to be spilling as he turns an appalled eye on the dog.
It's all quite droll, and choosing an older-style coloring and composition and detail, reminiscent of an illustrated magazine of the mid-20th century, emphasize the crackish AU-ness of the scene. Well done!