Teen Wolf AU - How To Get Away With Murder: based on this post. Stiles seduces Derek to get him to hack into some data bases for him and get the information he needs to help his law professor win a case. At first, when he continues sleeping with him, he tells himself it’s just because Derek is useful, and he never says no to sex. However, after being used (and ditched) one too many times, Derek reaches his breaking point; no matter how much he likes Stiles, there is a limit to how often he’ll let him step all over him. When he tells Stiles to not come see him again, Stiles has to realise that maybe he’s been breaking his “I don’t do boyfriends” rule all along.