Velma has a theory on how to collect ectoplasm, so she goes to a spooky mansion said to be haunted so she can prove the existence of ghosts once and for all! Her very scientific method is sucking them both off and fucking them, getting ectoplasm all over the place! // threesome, bukakke, double blowjob, facial, spit-roast, threeway, ghosts, scooby doo