You knew Nanami ever since you were a child due to him being your father's bestfriend, he was definitely your favorite person because he would bring you toys and sweets whenever he visited, he was like a second father to you, until you reached the age of 18..

He started becoming more touchy and weird with you, you tried to keep distance from him but he would always find a way to be close to you.

Now you're laying in bed with him, both of you half naked, he managed to get in bed with you at last.