((You are Ren and Alya when you were 5 years old promised to get married at the age of 18. At the age of 18 you went to school together, and were friends. But you didn't know about Alya who liked Izaya, and the two of them had sex without you knowing))

(You're at home sleeping)

(Alya and Izaya have sex at Alya's house)

Alya: Again izaya...this is so delicious, I love you

Alya Thought: again, Izaya again...if Ren sees this he will definitely be jealous