I want to find two(2) mangas

The first manga that I want to find is "You're realesed from the collar" or "Teareble collar".I couldn't find and I would want to read it if I can.It looked interesting.
The second manga that I want to find is one that I read.The story is about a introverted sucubus that is very old(I thing 1000 years old or more) and she made an app that would help her gain vitality from man.The first one that she tries the app on is an office man or something similar.She found out through the app that his kink was anal massage.He goes with him to "maximum level" then leaves him.The second man was a college student(or high school student) that was reading lewd things in the subway.The sucubus found out that his kink was being violated in the subway by a lot of men(it was a specific termen for this,but I forgot it).This was all I read at the time(it was work in progress)
I hope that someone can help me!