Mash(temporary name)

Mash was walking down the hallway deep in her thoughts. She came through a lot in short time, explosion in Chaldea, merging with Servant, Lev's betrayal and Olga's ****, but she wasn't alone Ritsuka, her new Master, was with her and though they know each other for short time she seemed like reliable person, and now she's Demi-Servant as well.

"Okay, Mash calm down, calm down... Oh I'm near Master's room..." - she saw that door was slightly ajar, so Ritsuka most likely was still inside, so without thinking she entered the room.

"Mmhh..." - Ritsuka decided to give in and continue jerking off her new huge dick. She couldn't say she had good imagination, but now her head filled with pictures of beautiful women, and the more Ritsuka concentrated the more these women reminded one particular girl - Mash. She has pretty cute face and to Ritsuka's surprise Mash was rather curvy, though in Chaldea she hide her body under loose clothes, but in Fuyuki Singularity she was dressed... rather provocatively, in black armour that looked more like swimsuit than actual armour. So Rits was jerking off thinking about her Demi-Servant and was close to the edge, and couple moments later, with a loud moan she came.

"Hey, Master? Are you ready?" - suddenly door opened and Mash come in, right into middle of Ritsuka's orgasm. - "Ah! Wha...!"

Ritsuka stroked her huge dick faster and faster and couple moments later she came hard. Cum flew couple feet and painted the door... and Mash who opened door at the wrong time.

"Mmmhh! Ah~ Oh! M-Mash?!" - Ritsuka exclaimed as she noticed her Servant when her orgasm dies out. Mash stand in doorway soaked in her jizz, extremely embarrassed and not knowing what to do. - "I-I uh... um, sorry?"

"M-Master what was that? W-where did that... t-thing came from?"

"W-well, it already was there when I woke up... And sorry for your clothes... You can use my shower while I look for some clothes for you, okay?"

"Um, okay... it's not like we have much time..."

Some time later...

"Oh, there you are, girls! I began to worry, what you two were doing?"

"Um, n-nothing..."

"Okay, and Mash, isn't it Ritsuka's clothes on you? Anyway, are you ready? Or we can try to summon again..."