Eventually the four, albeit with some protest from Sakura, decided it was best to go to Illya right away so that Shirou could get back to normal as soon as possible.
Then Shirou, Saber, Sakura and Rider after locking the house began to walk towards Illya's villa but shortly after Shirou noticed various problems that his new body was causing him, namely:
her new huge breasts bouncing with every step created a very strange feeling that made it difficult to concentrate, plus those same breasts being quite heavy made walking slightly more tiring and finally as you might expect looks, especially from the male gender , they were much more intense than usual and focused mainly on two areas of her new body or her breasts and her butt, especially thanks to her clothes that left the two areas quite uncovered.
Shirou did his best to ignore all these problems but still he felt really agitated and embarrassed, but luckily for him Saber had noticed his agitation so to reassure him he took his hand and told him
"You don't have to worry Shirou, we will surely find a way to get you back to normal"
Thanks to these actions of Saber, Shirou was able to calm down, while Sakura having noticed the whole scene of her regretted not having had enough courage to comfort her Shirou.
In the end, after a long walk, the 4 arrived in front of the door of Illya castle, but before any of them could even try to knock, the door opened and Illya came out and immediately ran towards Shirou and then hugged him, saying
"Welcome Onii-chan !!"
Shirou was obviously surprised by Illya's actions so after greeting her he asked him
"Good morning Illya, how did you know it's me?"
Illya replied by saying
"When I saw you arrive thanks to one of my familiars I immediately noticed that there was a person I did not know so I tried to observe you more carefully and I noticed your command seal and then analyzing the situation I realized it was you, however we enter so you explain to me what happened "
After saying this Illya broke away from Shirou and entered the castle, so the four of her followed closely.
So once we get to Illya's huge dining room, Illya order Sella, who was there in the room waiting, to make tea for everyone, then once everyone was seated, Illya said
"Well, tell me everything you know"
So they told Illya everything they knew about Shirou's situation and after hearing the whole thing Illya said
"Well, even if I can't tell you how to get Shirou back to normal, I think I know who did this but I'll tell you on one condition which is ......."