My idea for this SCP will be
-A sapient/differing version of a particular species of spider that is red and small (Still looking for one)
-These spiders will usually mate and pregnant female SCP-XXXXs will find children 2-10.
-Infiltrates body by going through left ear. (Keep in mind these are small spiders and children will most likely not notice it going into their ear)
-Somehow (I need help with some scientific method of how they do that) controls left side of brain to access their subconscious as a friendly entity that helps them out.
-Over a course of about a month or so (could vary) pregnant female SCP-XXXX will lay eggs inside their head.
-Mother injects a toxin into brain killing off their mind, infant SCP-XXXX will somehow control body, and the childs body is basically turned into a living SCP-XXXX nest.
-To identify a child who has had this happen to them. Their Pupils will be extremely dialated and they will have three red circles in a triangular formation on their forehead.
How does it sound?