Some of you guys really making the red head as a bad guy for choosing Silver head instead of blonde head. Red and Blonde never had any sexual relationship except for just being a client and psychiatrist. Blonde just got a lil to obsessive with Red boi. Blonde needs to go seek help his crazy is leaking out of that ass.
If i remember correctly:
It was during war era/ solider/captain.
The uke was capture by the seme and was being torture/hardcore sex/S&M because uke was working for the other side. But, in the end they were just role playing the torture part. When they where done with the whole boom boom they went back to their post.
I didn't see the ending so I'm not sure but the rest of your description fits this sorta. Enjoy~ http://www.mangago.me/read-manga/zion_no_koeda/
1.They're couple, living in the old apartment/dorm. When they go outside, they always saw the crack on the wall of the dorm. And said something about "how old the building..."
Apparently, they're the caused because they're having sex everynight and make the room shaking. And making a crack more bigger. And they never realised about it.
2. A manga that he was force by his drunk s father to sell his body then he found a glasses guy that buy him for other reason.
The first one is this
http://www.mangago.me/read-manga/kimi_no_ai_wa_mienikui/mf/v01/c006/3/
Second one sounds interesting
Similar plot for 2nd one but seme without glasses
http://www.mangago.me/read-manga/mae_yori_mo_dare_yori_mo/ (1st couple)
https://boylove.cc/home/book/capter/id/39638
Please anyone pick this up and update it