Fanlisting

A fanlisting is simply an online list of fans of a subject (in this case for archer & tohsaka rin) that is created by an individual and open for fans from around the world to join.
There are no costs, and the only requirements to join a fanlisting are your name and country. Fanlistings do not have to be large sites (although some are), they are just a place where you can sign up with other fans. TheFanlistings.org is the original (but not official) web directory for fanlistings, dedicated to uniting the fans.
Description from tfl.

Relationship

Archer doesnt’ like Rin that much (she's even listed as one of his natural enemy in the game), probably because she tries to encourage and protect Shirou, or maybe because he doesn’t really enjoy her personality. He finds entartaining flattering her (and it’s not easy understanding if he really admires her that much or if he’s only joking), and although she finds her somehow odd he truely thinks she is a good and smart Master. He states that he only fights righteously along side with her, so it means he really trusts her and he’s ready to obey to her orders no matter what…or well if their interests are the same. He doesn’t seem that disappointed or sorry in betraying her in UBW. On the other side Rin dislikes Archer for other reasons, although she can’t complain for having him as servant. She thinks he’s reliable and efficent but she’s much more interested in Saber (her lackness in interest is probably the reason why he always ends up in being killed because of her orders). Anyway Rin feels respect for Archer and she managed to also enjoy his oddness. Rin somehow considers him as a sort of belonging, probably because she's a proud and authoritative person and since he's her own servant she probably considers him not only as a person, but as someone who is under her own protection and power. She feels sorry for him when he's killed in the scenarios and she wants to avenge him for his sake but probably because she feels responsible for having lost him. She really feels bad as he betrays her in UBW because she wasn't expecting it, or probably because she's a very good person at heart. Anyway I really don't think there's any romantic development for them, I feel like Shirou x Rin is more possible and understandable.