My best friend is a vampire (1988) Fullscreen

In Houston, the teenager Jeremy Capello is a normal middle-class boy, who lives with his beloved parents and has Ralph as his best friend. He has a crush on Darla Blake, but he is shy and does not date her. He works making deliveries for a supermarket and is seduced by his sexy client Nora. While having his first intercourse with her, Jeremy is transformed in a vampire. His friend Ralph is mistakenly chased by two weird vampire hunters, Prof. Leopold McCarthy and his assistant Grimsdyke, that believe he is a creature of the night. Meanwhile, Jeremy learns how to use his new powers with Modoc, and falls definitively in love for Darla.