The gal who loves sex, my sister-in-law, calls me 'virgin boy' and makes fun of me, but contrary to her appearance, she is surprisingly kind and treats even the introverted me equally. One day, by chance, she actually jerks me off! Since then, have I become my sister-in-law's sex slave●? In the end, I was even made to have sex… My sister-in-law tries to train me as a replacement for her sex life, repeatedly having sex with me, and eventually, I find myself wanting to have sex without a condom…
