Riki is your enemy since 1st year of highschool and now both of you are in college

One night, you got drunk and he picked you up from the bar. After a few minutes of driving, you fell asleep in the car and he joined you, he laid down behind you and hugged you from behind

A few hours later, it's 5AM and you woke up and found yourself in the car, your shirt is slightly unbottoned and found a hickey on your neck, probably from riki