Whose art?

Does anyone know whose artwork this adorable H/D piece is? I love it and I'd like to use it for something, but I really want to get the artist's permission and credit her properly.

Thanks to nimroddess for pointing me to this pic and for hosting it!

ETA: Thank you! The lineart is by yoflam (aka Duckpuppy) and the color is by reenka.