I like the expressions in this one here, though the sex is not that much? And careful, the link isn't for the first chapter!!
http://www.mangago.zone/read-manga/hitorijime_no_jouken/sa/sa-v1c005/33/
Also junkos facial expressions are really good...
One of my fav has all this ლ(´ڡ`ლ) Have a bite and check the sequels!
http://myreadingmanga.info/inumiso-darkness-hound-1-eng/
Continuing...
You probably already read most of these, but they're the only ones I can remember for now, sorry.
First, all Zaria works have good sex and expressions (her art, gosh!), try:
http://www.mangago.zone/read-manga/sweet_dinner/
http://www.mangago.zone/read-manga/the_awaiting_flower/
http://www.mangago.zone/read-manga/escape_from_the_night/
http://www.mangago.zone/read-manga/taiyou_to_himitsu_secret_and_sun/
Then, for uke face and seme face, there's no wrong with Nekota Yonezou's Hidoku Shinaide djs. Some recomendations:
http://www.mangago.zone/read-manga/namida_hanamizu_gusyogusyo_danshi/
http://www.mangago.zone/read-manga/omocha_ni_shinaide/
http://www.mangago.zone/read-manga/hidoku_shinai_de_dj_boku_no_brief_ni_ana/
Maybe you'll find it lacking in sex, but the expressions are great and the buildup for sex scenes is so, so good, that (at least for me) it feels like good foreplay ;P
http://www.mangago.zone/read-manga/seito_kaichou_ni_chuukoku/
If all you need is sex, then have it pwp :3 (I don't really like these, but, each person has their own taste)
http://www.mangago.zone/read-manga/baby_bitch/
http://www.mangago.zone/read-manga/animal_play/
If you think ahegao pwp is fair game, there is Tomcat. Read it all, read it all o/~
http://www.mangago.zone/read-manga/competition_training_love_swim_tomcat/
I would love to read something like that!
ε=ε=(ノ≧∇≦)ノ thank you so much! mmmm i luv em all!
check out ogeretsu tanaka's mangas, great expressions and great sex scenes, and the storylines will get you hooked as well
a yaoi where the uke and/or seme have really good expressions.
and a lot of sex. like a lot.