I am often told to stop being creepy and weird.
One thing I fear may not be clear in this comic is that Raven’s initial "oh snap!" moment is while looking at Grace. He then shifts his focus to Ellen and realizes… well, something you all don’t need to know yet. It’s not immediately important and will be addressed eventually regardless of whether this comic is not as clear as I would like. Point is, whatever his reasoning behind his sudden change of heart, it applies to both Ellen and Grace.