Adolescent boy is continually going into his female cousin's underwear drawer to steal her pads. And he's in the habit of using a new pad every two hours. TO JERK OFF WITH AND IN!

This is classic autogynephilia. It's how it always starts. Boy in puberty violates personal boundaries of female relatives or household members by sneakily invading their privacy & stealing their underwear or other intimate items in order to use them as masturbatory aids.

These boys do this not coz they're "gender confused" or "exploring their feminine side" or were "born in the wrong body" or "might be trans." They do it coz rubbing their dicks & balls on "girly" items - particularly ones that belong to girls/women close to them that the boys know possess real vulvas, vaginas & breasts - gives them a massive hard-on. And coz when they finally cum, it provides them with an extra special, super-duper, gigantic, explosive erotic charge that these guys call "gender euphoria."

The whole "transgender" story line is just a cover for this classic AGP behavior. This boy isn't some new breed of girl, nor will he grow up to be any kind of woman. He's a con man whose whole focus is on his dick & getting off, as is the case with all these guys.