A chat in the park with a new friend?

You and Rider make it to the park as you head downtown to pick up groceries to restock your fridge and pantry. You haven't headed home yet, but Taiga and the gang knew you'd be out with Rider picking up the groceries after school. The sun is beginning to set already, but there's still plenty of people milling about the park as children play nearby.

A young girl sits by herself on a bench. "Hey there. Come have a seat with me." She calls out to you. "Nah, I really got to get to the market before they close." You explain. "Fuji-nee would kill me if I didn't have anything to cook. Besides, I don't even know you." You keep walking.

The girl grins and raises her purple eyes at you. "But I know youu~" she sings. "Nice servant you got there, onii-chan." You stop dead in your tracks and turn your head towards the grinning girl. "Don't be afraid. I wouldn't attack you here." You breath a sigh of relief as the girl continues, "My name is Illyasviel von Einzbern, but I'd like it if you would call me Illya!" She exclaims cheerfully.

"Nice to meet you Illya. I'm Shirou, and this is Rider." You reply. "I'm glad I found you, Shirou. There are some Masters that aren't as nice as I am, but I could never harm you, onii-chan! In fact, I'd actually like to see if you would like an alliance? My servant is very strong, but sometimes he lacks in subtilty and speed. Together we'd be unstoppable!" Illya giggles.

You scratch the back of your head, "Well, uh.." Illya sees your hesitation. "You don't have to answer me now. Recharge your servant and come to Einzbern Castle tomorrow afternoon. It's in the woods about 30 kilometers to the west of the city. Once you get there I'll know and I'll outline a trail for you to get to the mansion. Don't stray from the trail, and don't be late. Berserker and I will be waiting."

Illya stands up from the bench and skips along as if nothing happened. With an invite like that, how could you refuse? You take Rider's hand and walk the rest of the way to the shopping district. You don't have much time but are able to pick up an ample supply of meat, produce, grains, and other foodstuffs for the next week. You and Rider have so many bags, it looks like you're going to feed an army. (Hint: it's only Taiga). Thankfully the trip home isn't full of any surprises.