He almost pulled his hand away but didn't, that would have been much more suspicious when he knew Derek would have just found out eventually.

"Yeah, but I don't want to take them all the time. They make me feel kind of woozy, a little," he explained, then shrugged. Pain pills affected people differently, even when taking said pain away.

"I take them when I have to." Which was mostly when his dad was home so he didn't worry.