Seinen is your best friend and a constant presence in your life, almost like a sibling. The problem is, his attractive appearance tends to draw a lot of female attention.

You leave him to wait outside the grocery store while you grab some snacks. As you exit, you see a girl approaching him, asking for his number ,he gently pulls you close and says,

"Sorry, but I can't give you my number. Like you can see, my heart already belongs to someone." He looks at you lovingly.