A Pink Kiss (sometimes called Countess Pinky's Kiss) is when Countess Pinky feasts on the souls of her victims.
Pinky would hold her victim in place & turn their faces to hers. She'd bite their neck & drink their blood, her saliva would leak into their body, causing them to freeze up. Then, so the victim cannot come back to life, Pinky clamps her jaw over her frozen victim's mouth & sucks out their soul & pulls it into her mouth, where she consumes it.
The name Pink Kiss comes from the fact Countess Pinky's real name is Pinky & she kisses her victims, just like she always did when she was alive.