ug ▁in ▁the ▁lab ▁in ▁the ▁next ▁episode ▁( 3 . 1 2 ▁" Sil ent ▁Night "). ▁Later , ▁by ▁episode ▁ 3 . 1 6 ▁" He art ▁of ▁G lass ", ▁Mac ▁and ▁P ey ton ▁have ▁evidently ▁open ly ▁acknowled ged ▁their ▁relationship , ▁when ▁they ▁show ▁up ▁together ▁at ▁a ▁crime ▁scene ▁on ▁Mac ' s ▁day ▁off ▁because ▁P ey ton ▁is ▁on ▁call ▁as ▁the ▁Medical ▁Ex am iner . ▁ ▁D anny ▁Mess er , ▁who ▁has ▁already ▁arrived ▁on ▁scene ▁as ▁the ▁C SI , ▁says ▁he ▁thought ▁Mac ▁had ▁the ▁day ▁off . ▁ ▁Mac ▁confir ms ▁this , ▁but ▁says ▁that ▁P ey ton ▁was ▁on ▁call ▁& ▁he ▁is ▁with ▁her . ▁ ▁D anny ▁then ▁asks ▁Mac , ▁" So ▁am ▁I ▁the ▁last ▁one ▁to ▁hear ▁about ▁this ?" ▁ ▁To ▁which ▁Mac ▁rep lies , ▁" I ▁guess ▁so ". ▁ ▁D anny ▁asks ▁if ▁Don ▁F lack ▁knows , ▁and ▁Mac ▁confir ms ▁that ▁he ▁does . ▁ ▁This ▁seems ▁to ▁indicate ▁that ▁D anny ▁is ▁indeed ▁the ▁last ▁to ▁know ▁about ▁the ▁relationship , ▁and ▁no ▁one ▁at ▁the ▁lab ▁has ▁expressed ▁any ▁res erv ations ▁about ▁it . ▁In ▁ 3 . 2 4 ▁" S now ▁Day ", ▁P ey ton ▁invited ▁Mac ▁to ▁go ▁with ▁her ▁to ▁England ▁while ▁she ' s ▁there ▁for ▁a ▁medical ▁exam in ers ▁conference . ▁She ▁wants ▁him ▁to ▁use ▁ten ▁days ▁of ▁the ▁seven ▁weeks ▁of