House is at home watching wrestling when the phone rings. It's Chase and Cameron informing him that Chase was bitten by a little boy. House doesn't care and hangs up. I don't know what they were expecting. House goes back to watching wrestling, and then he gets an idea. He calls Chase and Cameron back and says that Jasper isn't being a sociopath at all -- he's being a guy with a crush and way too many hormones. Which means the same thing that's affecting Lucy is affecting Jasper. And yet, his voice hasn't even begun to change.
After commercials, Chase says they found one hundred times the normal level of testosterone in Jasper's body but couldn't find the tumor causing it. Foreman says it must be something environmental, then, and that it's something both Jasper and Lucy have come in contact with. Cameron not-so-subtlely wonders why Foreman doesn't know that they were up all night testing everything in the Deran house and came up with no sources. "You went home?" House asks Foreman. "Good for you!" Cameron can't believe this, although I don't know what she was expecting after House congratulated Chase for doing the same thing. I do love watching everyone stick it to her, though, and watching her moral outrage response.
Chase wonders if they're looking at something genetic. He points out that Lucy and Jasper's mother might have died from the same thing. Cameron doubts this, saying they didn't find any tumors in Jasper's brain or Lucy's, and that the mom didn't show these symptoms before she died. Chase says that if the symptoms are pubic hair and menstruation, then she did. "That's ridiculous. If menstruation is a symptom of brain cancer, then I should be on chemo right now," Cameron overshares. I guess this explains why she's being so bitchy to Chase, though. "That's ridiculous. You're way too skinny to be menstruating," House responds. He tells them to pull the mother's medical files and look for any similarities, and to be sure to bleed Jasper out so he doesn't have a stroke like his sister. I'm sure Chase would be happy to oblige.
But no, Foreman's the one who gets to bleed Jasper, who angrily requests Cameron instead. Get the hint, Jasper -- she doesn't have feelings for you. Hotter guys than you have been similarly rejected. Foreman ignores Jasper and talks to Deran, who asks if Jasper's recent behavioral problems are because of the testosterone. Foreman says that they probably are. I didn't know testosterone made you an obnoxious asshole, but I can't say that I'm surprised. Lucy starts crying out that her tummy hurts. Jasper tells her to stop being a baby, because testosterone makes you mean to your sister. Lucy starts screaming in pain.