"Not the time, we need to stop-" The sound of a window smashing open stops Rin. Looking over they see Shinji and Rider outside and heading towards the roof.
"Considering we are going to die, I think this is the time!" Kazuma says.
"We won't die! We can summon our servants with a command seal and-" Rin says.
"Why do you even care if I am interested in Sakura? Are you actually jealous~?"
"Of all the- No you dunce! I just don't want you going after my sister!" Rin shouts before blanching and cupping her head.
"She's your sister?!" Kazuma and Shirou ask at the same time.
"This is not the- What in the…?" Rin freezes at the sight down the hall. Turning around Shirou and Kazuma see a skeleton with a blade…then a few dozen more.
Rin summons archer.
Shirou Kazuma promptly summon their servants too, who begin attacking the skeletons…Except for Lancer.
"I don't know, you sure you don't want to form an alliance with them?" Cu asks with a grin.
Kazuma raises his hand, silently threatening another command seal, and making Cu go and clear a hallway.
Kazuma looks at Rin flatly as they ascend towards the roof.
"…What drivel are you thinking?"
"And I thought Shinji was contemptible, but offering up your sister?"
"I would have killed you if you made a move on her you pervert."
"I'm not a pervert! I'm a healthy young man with a healthy interest in women!"
"…Are you seriously saying that to me now? Besides, the ploy got your shut in ass out here didn't it?" Rin asks with a grin.
"I am not a shut in! I died outside multiple times!" Kazuma says as they open the door to the roof and collectively blanch at the sight before them.
Shinji flat on his ass, looking in horror and panic as Rider is stabbed by Medea's jagged blade, the book in his hand now nothing but ashes on the ground.
"What just happened?"
"I used my Noble Phantasm, Rule Breaker, to make your servant my own and- Huh?" Medea staggers back a step when Rider hugs her.
"What are you doing?"
"Showing my appreciation to a benevolent master…" Rider says with a smile.
"…But I haven't done anything but stab you."
"It's better than what he has done…before we go, can I kill him?" Rider asks, making Medea blink under her hood.
"Uh…Sure? May I ask why?"
"Yeah, Rider, why!?" Shinji asks with undue guts before seeing Rider turn to him while cracking her knuckles and taking off her blindfold, her eyes smile of anticipation sending shivers through Shinji.
"You convinced my original Master, Sakura, to give her seals to you, sexually assault her nearly every day on top of verbal abuse, is a contemptible young man who has leered at me every possible chance, and if I were to be wholly honest…your face is begging to kicked in and thrown off this roof."
"We should watch and let things play-" Rin starts to say before Kazuma slams the door open.
"He's done what to Sakura?!" Kazuma yells out while walking out onto the roof.
"It would be swifter to list what he hasn't done." Rider says, about to continue until she sees Kazuma start kicking Shinji. After a moment of shock she joins in, kicking her former master on the other side, leaving Medea, Rin, and Shirou to watch in shock; Rin walks out and joins them in kicking Shinji as well, surprising Kazuma and Rider.
"He's leered at me too…Also can you turn this field off?" Rin says while still kicking him.
"I already lessened so it won't harm anyone but will leave them unconscious…giving us extra time~." Rider says with a smile before resuming to kick the whimpering Shinji.
'…I'm surprised I'm not the villain here.' Medea thinks.
'Can't save him…' Shirou thinks, before seeing them all speak to each other in a whisper. Then Kazuma and Rider heft Shinji up and throw him off the roof like a javelin, and Rin tags him with a gander shot.
They all look to the sky with smiles on their face as Shinji disappears from view.
"…Are you sure you don't want to join forces?" Medea asks.
"I'm not giving up Cu."
"…The offer still stands when he dies from other means. I doubt the twin tailed girl will be as steadfast an ally as me~." Medea says before taking to the air with Rider.
"How dare- Ugh!" Rin says while clutching her head. Then she hurries down the stairs.
"Kazuma, call off Cu! He's attacking Archer again!"
===
Saber watches the two servants attack each other when the three masters enter the area.
"Cu, what the Hell?"
"He has Caladbolg; that is Fergus' weapon! This guy is beyond suspicious!"
"He's just a weeb for European stuff."
"I am not!"
"Give me one reason not to skewer you here and now!"
"This is not the time! Did you forget Heracles exists?!" Rin shouts.
"Plus there is the whole matter now with Rider being one Caster's servants." Shirou says making Archer look wide eyed at him.
'What?! How the Hell did that happen?!' Archer thinks in abject shock before looking over at Kazuma.
"You got something to say?"
"I know Rider's identity." Archer says, shocking everyone.
"How do you possibly know that? Or are you going to say amnesia again?" Cu asks.
"Selective amnesia~." Archer says, eliciting a stab from Cu.
Rin looks at Kazuma.
"I'm not wasting a seal on this. From what I know, generalized commands don't really work. " Kazuma says, getting a laugh from archer and a glare from Rin.
"Why are you-" Kazuma stops when Rin points to the ceiling and blows out a chunk of the material before training her hand on his head.
"…Is this how you treat an ally? What have I done to deserve this?"
"Are you seriously asking me that right now?"
"Other than the accidental stealing of your plain underwear!"
After resisting a murderous urge, Rin gestures to Cu still trying to kill archer.
"…Maybe they'll become best friends after fighting it out?"
"Never!"
"Not in a hundred lifetimes!"
"Wait a minute…can't you just use a command seal to make Archer tell us the truth? Or are you going to continue holding that information to yourself to give you an advantage?" Kazuma asks.
"…Much as I dislike agreeing with him, he has a point Tohsaka." Shirou says.
"It's only an advantage if I know who he is…as for using a seal to do that, I can't." Rin says, holding up her hand to show only one seal.
"What did you use the first one on?" Kazuma asks, making Archer laugh again as he parries Cu's spear.
"…A general order to make Archer obey me…"
"How's that working out for you?" Kazuma asks with crossed arms and a smug grin despite the magical finger gun jamming into his head.
Shirou looks at the scene of two servants fighting, two masters glaring at each other, and Saber watching listlessly, and feeling himself become vacant eyed.
'…With allies like these…'
===
Eventually the makeshift group returns home, Cu eventually realizing he cannot get through Archer's defenses, and Archer being unable to best Cu.
Taiga naturally challenges Rin and Archer to a duel before they can stay there.
They both won, and Taiga is nearly in tears at the more crowded dinner table.
"…Don't you think it's cheating to use magic in your limbs to win a mock sword fight?" Shirou asks Rin in a whisper.
"Between Caster matching our numbers, Heracles being a problem, and whatever Kirei has in the church, I didn't think us staying separated would be a good idea…"
"Indeed…it as I predicted." Kazuma says while fanning himself with a white fan.
"…Predicted what? And why are we having Chinese style meat buns tonight?" Sakura asks.
"Because we have entered the 'Three Kingdoms' Period of the war." Kazuma says while looking squarely at an annoyed Archer, a vein on his head threatening to rupture.
Shirou and Rin look on in growing exasperation.
Sakura and Taiga are still confused.
Saber eats her fourth meat bun.
"That is hardly the proper line for this situation." Archer says with a clenched fist at his side.
"Much as I hate agreeing with this ugly bastard-"
"Why you-"
"He's right…because…~" Cu says with a grin before pulling out his own fan, making Archer groan.
"The enemy is at Fuyuki Church!"
"That's just plain wrong!"
"I would rather wrong others than allow them to wrong me!" Cu and Kazuma say at the same time.
"I am the-" Archer takes a deep breath and stops himself.
===
Rider and Medea arrive at the temple, and Rider pales before readying her weapon at the sight near the gate.
"Relax Rider…he is not a threat."
"How can you say that Master?" Rider asks before the figure opens its mouth, a croaking sound escaping its scarred throat.
"Kill me…it burns…."