MASM-002 The story of how I, an adult, had my pride shattered and became a pet dog after being called 'zakozakosaa~ko' by a bratty blonde student bitch

I ended up being assigned as the tutor for Egawa Noa, who is rumored to be a problem child. I was determined to make her study properly and reform! But I got pushed down and made to ejaculate inside while she rode me!? 'If I tell headquarters about this, your life is over, old manw' I can't defy her anymore... After that, I ended up being kept as a dog by Noa-chan, and my pride as an adult was shattered... My hellish days of having sperm milked out until my balls were empty began.