wolf in the house and momentum!
http://www.mangago.me/read-manga/tamayura_yuki_ringo/
^the sex was pretty sensual in this one too
http://www.mangago.me/home/mangalist/50912/
I've properly put notes on each, just avoid the tropes/warnings you don't like
Following
Try momentum and wolf in the house they are from the same author but danm, the story the plot and the sex scene are all so sensual and passionate, it's not just sex but you can feel the character emotion plain as day in between those panel.
WAIT ヽ(`Д´)ﾉ
No rampant sex / sex everywhere ( is so boring ) #－.－)
long scenes (various page) with passion, realism, details (examples: Sonomama de, Blue Sky complex) (⌒▽⌒)