I'm not sure if it's allowed to recommend other works in independent threads. The series Inari, KonKon, Koi Iroha has a side lesbian + love interest. Not sure how that is going to work out, but it's cute and worth reading. I was pleasantly surprised by my random luck to have found some yuri side-coupling going on in it. There is a scan group with their own dedicated website that you can read it from. Incidentally, they also do A Certain Scientific Railgun.

Let me know if this is against any forum rules.