[Arduino] Sofware I2C Slave Mode

Hello everyone,

I was wondering if there´s a library capable of making a sofware i2c as slave.

I was searching but most of the software i2c are for slave mode.

What i want to do is:

i have an arduino reading an mpu and processing the data. i have another microcontroller as master reading other sensors i want to free this from the processing of the MPU because it takes too much time. i want to join the arduino as slave using a sofware I2C to avoid any conflict with the bus and to have the MPU data the faster as posible thats because i dont conect it to the harware bus.

Its there something i can do to acomplish this?. Thanks for your time.