H-manga with Ahegao had taken my fav spot. I find them alot in Alice no Takarabako (the art style is OK, not the best but I feel that this artist depict Ahegao the best)
I think ahegao is pretty hot when its done well. I don't like it as much if its in a rape, NTR, or mindbreak setting but its still arousing even with those genres. I just enjoy ahegao to the fullest in more consensual and happy sex. One artist who I think does a good job with ahegao is Tsukino Jyogi in the Afterschool series.
Sometimes its nice. I like it especially when involves couples are two characters who are romantically in love in the doujin/manga. Its nice in real life too, heheh