Neil first tells Kevin, "put a leash on your pet-monster or I will", and then proceeds to make Andrew fall so hard for him that Andrew slips that leash on willingly.
Neil who always forgets to take his meds bc who even needs meds he's fine and Andrew who always has them sorted in those little pill organizers. He is in charge of shoving them down Neil's throat, or maybe dropping them in Neil's fruit salad so he'd actually take them