GRAPHIC/MATURE Rin has lost her servant. With her defenceless, Lancer means to take her life, and her mana - in the traditional F/SN manner. Sex, for the uninformed.
There's also a smaller story focusing on Lancer, during his death in UBW.
Double Spiral Series: Fate/Stay Night
Lancer/Rin, Archer/Rin, Archer/Saber
The translation of the second half was done by an anonymous over on /tmh/, while the editing was done by Anonygoo.
GRAPHIC/MATURE Several smaller stories - one in which Rin summons Lancer rather than Archer, another where Archer and Rin take a bath, and yet one more where Archer and Saber share some quality time. In other words, solid smut all the way through.
