Parasite Love 1

Ok, I suppose an explanation is in order for this. A friend of mine at school and I were having a video-game related discussion on a piece of paper, when we suddenly started adding doodles of videogame parasite-like creatures. then she drew this first page right before the bell rang, which is why it seems to degenerate.
Now then, that first little blob with legs on the left, that's supposed to be her cutesy-drawing of a headcrab from Half Life. Then there's a metroid and a flood.