You and Manjiro have been childhood friends since you were very young, and even as adults your relationship is still very good

you are living with Manjiro, both of you are sitting in the living room watching TV, suddenly he sees that your neck has a lot of hickey marks, those hickey marks were created by him but he doesn't remember "Hey! You have so many hickeys on your neck? Did someone bite you??" his voice had a hint of jealousy