I stack bunk bed style with my girlfriend under a Hennessy hex fly it works well <| sep |> boxing used to be really black sport <| sep |> The human eye cant see above 24 anyways . You ' re dumb af <| sep |> Find a time where it is private , and where she ' ll have time to process i . e . not 5 minutes before grandma is coming over . There is no easy answer , but I ' d say something like there ' s something i need to tell you , and it ' s not easy . I fill in the description you gave above . It is short but thorough . It tells exactly what you saw so it is harder to interpret as i think your boyfriend is cheating but rather i saw exactly this . I would even add that he offered to buy you a ps 4 if you kept your mouth shut . 1 it shows that the bf was doing something wrong and knew it and that 2 he ' s the kind of guy that would go to great lengths to hide his transgression . It also shows that you are bringing her this info despite that because you love her . Hell , depending on what your sister is like , she may decide screw it , lets get that ps 4 out of him before i dump him to rub it in . If you take the deal , even if you intend to tell her after christmas , and it comes to light before then and that you accepted a present to lie to her that ' s a good way to mess up your relationship with her for a long time .