Right. Let's. [Cain reaches down and tilts Eridan's head appropriately, careful not to man-handle his fins or gills or any of that other weird alien stuff on his head.]
[It also helps to prevent Eridan from mistakenly going for an actual kiss-kiss, which would be horrible for everyone involved, especially Cain.]
[Leaning down, Cain plants a kiss on Eridan's forehead, slightly scratchy for his carefully-cultivated stubble and maybe a little damp but otherwise a perfectly serviceable kiss for a grown man to give a child.]