Someone can tell me this title cover http://www.mangago.me/read-manga/tasogare_wa_karera_...

1. Sorry dunno.
2. I believe it's just an illustration from Kyuugou. I remember seeing a compilation of different sex positions drawn by different mangaka.

Thank you

For number 1, I think there's no translation yet.
https://www.mangaupdates.com/series.html?id=91874

Second is from here
https://myanimelist.net/manga/48435/BLT48
It's a book by different mangaka for illustrating different sex positions ;)
https://www.google.co.uk/amp/s/hazukashiikedo.wordpress.com/2012/09/19/blt48/amp/

Boy, do I want that hard copy for my own reference ლ(´ڡ`ლ)

Same here ;)