Which other book?
http://www.mangago.zone/read-manga/our_house_love_trouble/
the first couple has a freaking chilled uke.
I've read this, some call it oblivious, we call it chill
lol, he's chilled. He accepted the whole mistaken identity thing, knew they were having sex, and the whole time he responded calmly. oblivious is when they don't realize a damn thing. As the main character in this book has noticed, but has calmly responded I think he is also super chilled too.
an approved stalker? Uht, why not just say you will be his friend. he is so freaking easy going. If this goes even to sex and he is the uke with that same easy goingness than he might beat that other character from another book whom I deemed the most chilled and easy going uke ever.