I2C send receive both directions

Projects Networking, Protocols, and Devices
1

Hello!
I'm still learning to cope with Arduino. Now there's a problem with data transmission from one uno to another. While I would like to send data only from MASTERA to slaves, everything's ok, learned and can transfer asmuch as I need. The problems started when I wanted to send data also in opposite direction. I need at the same time mutual communication. This is the link to the simulator - //circuits.io/circuits/4891134-the-unnamed-circuit.
End project is to connect 3 arduino, 1 master bearing the main program and 2 slave, where the two do what master forces, but master also has to recieve data from slave devices.

Master

#include <Wire.h>
int x;
int y;
void setup() {  
  Wire.begin(); 
}
void loop() {
   x=5;
  y=10;
  Wire.beginTransmission(1); 
  Wire.write("Dati");        
  Wire.write(x);
  Wire.write(y);
  Wire.endTransmission();
  delay(100);   
}

slave

#include <Wire.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int x;
int y;
void setup() {
  lcd.begin(16, 2);
  Wire.begin(1);               
  Wire.onReceive(receiveEvent);
}
void loop() {
  x = Wire.read();
  y = Wire.read();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(x); 
   lcd.setCursor(0, 1);
  lcd.print(y); 
  delay(100);
}
void receiveEvent(int howMany) {
  while (2 < Wire.available() ) { 
    char c = Wire.read(); 
  }
}
2

but master also has to recieve data from slave devices.

The master can receive data in response to a request. The slaves can not force the master to accept data.

void loop() {
  x = Wire.read();
  y = Wire.read();

Assuming that there is data to read on every pass through loop() is not reasonable.

3

Understand it, I watched the exsample how to send data to the master.
Do not know how to bridge the two codes so that they work at the same time