Heartbroken; Eremika angst fic

Part 1

Mikasa woke up at 5am on the dot, an hour before everyone else did. She got dressed and ready then went to the mess hall to get a cup of tea. Afterwards she took a walk around the training yard until it was time for everyone else to get up. She went to the boys sleeping quarters to wake Eren and Armin, more so her boyfriend Eren, he can never get up on time, Mikasa didn't know what he'd do without her. She woke him up with a kiss on the cheek, but to her surprise Eren was awake and grabbed her close and kissed her passionately on the lips, startling her at first but then she gave in. They continued to have a normal day with their average routine, breakfast, warm ups, running, hand to hand training, until lunch. Mikasa, Eren, and Armin were heading to the mess hall together when Sasha ran up to the trio. "Hey guys, wanna eat lunch with me?" She enthusiastically asked. "Oh sorry Sasha, Mikasa and I were gonna go eat lunch together by the lake, Armin can though." "Actually you'll need to eat in the mess hall today, I have an announcement to make" Instructor Shadis said as he was passing by. Confused, they all went and sat at a table together with Connie, Reiner, and Bertoldt. About 20 minutes into their lunch break, Shadis and a few other instructors/teachers were at the front of the room dinging a bell to get everyone's attention. "In one week we will be going north to the mountains and doing survival training." He finally announced. He continued with more explanation, but nobody actually listened. "That sounds fun!" Sasha exclaimed, "Totally!" Eren replied. Mikasa had noticed that Eren has been looking at Sasha strangely recently. She never thought anything about it considering Sasha was her best friend and Eren was hers no matter what.