Amira Hergal is a twenty year old woman who has travelled across the mountains near the Caspian sea in order to wed Karluk Ayhan, a young boy eight years her junior. Despite being far from her own village, Amira is a hard working girl who is eager to please and happily adapting to life in her new home. Now she lives a peaceful life with her new family, from going to meet Karluk’s nomadic uncle and baking bread to amazing the villagers with her archery skills. But when her old family decides to reclaim Amira and have her marry another man who will be more beneficial to the village, it seems her happy life with Karluk could be at an end...
Otoyome-gatari also features a 12 year old boy paired up with an older girl. Heck, the age difference is even greater there, but the thing is: Otoyome-gatari is completely different from Yoru Made Matenai. So if you thought that the age difference was interesting in Yoru Made Matenai, but ended up not liking it for some other reason, then you might actually enjoy reading Otoyome-gatari. If you did however like Yoru Made Matenai, nothing really prevents you from checking Otoyome-gatari out either.
If you'd rather read a manga which features similar age gap, but which is far more innocent than Yoru Made Matenai, then you can't go wrong with Dear Mine.
P.S. Beware: cuteness\sugar overflow ;)
Airi has always dreamed of marrying her fated true love and living a normal, happy life – a dream disrupted forever when Aram, a prince from another world, emerges from her grandmother’s mirror. She takes the young prince home with her thinking he is a lost child, giving him a home cooked meal and a place to sleep. However, in the morning she discovers that, as the result of a magic spell, Aram transforms into a 17-year-old boy whenever it’s dark, and her kiss is the only way to change him back! If that wasn’t enough, Aram is in hiding from his older brother, the evil sorcerer Jeile, who has fallen in love with Airi and intends to make her his bride! Will Airi ever be able to find her happily-ever-after?
Like Yoru Made Matenai, Merupuri also has this kid acting the possesive lover role (and waging war on all rivals, even the potential ones). The good thing about Merupuri is the fact that said kid is not a pervert. If you somehow liked Yoru Made Matenai, Merupuri might be worth a try.