Ghostbur and Revivebur were always very flirty to Quackity since they meet him. Quackity was also shocked to see there was two Wilburs now.. And literary flirting with him-

One day, Quackity was standing in a forest. Ghostbur behind him and holding his waist, nuzzlimg his face against the back of his neck. Revivebur was also holding him by the waist, also nuzzing against his left shoulder (Ghostbur was on the right) and smirking, and so was Ghostbur~

"hng~ f-fuck..~ tight~" Quackity said while his face was red.