This is a good one!
/r/SheMakesHerSuck: She Makes Her Suck - Do you have a fetish of girls forcing other girls to suck a cock? Well, this subreddit is for you! SheMakesHerSuck is a subreddit that is based on pornographic images, videos, gifs, etc... surrounding the fetish of a woman holding another woman's head to deepthroat. - April 14, 2020 - 06:25
She does the work for her friend
/r/Blowjobs: Blowjobs - Because some people like to get head. A community for people who want to share videos and pictures of women performing the act of fellatio. - April 13, 2020 - 20:36
Improvised Gloryhole
/r/GirlsFinishingTheJob: GirlsFinishingTheJob - GFTJ is a subreddit where the women take an active hand (or mouth or pair of tits or something even more exotic) in MAKING a man cum. If you like watching girls do all the work of getting every last drop of cum out of their men, this is the sub for you. - April 13, 2020 - 20:05