There were things that Stiles knew he shouldn't do, but he did them anyways. Snooping on his dad's calls, climbing into Scott's house, taking those few extra Adderalls; the list goes on and on. But he did those things irregardless to the consequences.
So when his phone buzzed, loud and clear despite it resting on his bedspread, Stiles couldn't help but to smile. He couldn't help but to race over to his bed and check the message. He couldn't help but to think of his reply. He couldn't help but to think of what the consequence would be. He couldn't help but to not care.
He figured that the reward was big enough to outweigh the consequence this time.