My Perfect Boyfriend's Secret Side is Mine Alone

Synopsis

My boyfriend, Shintaro Sakamoto, is the perfect man everyone envies. At the cafe where he works part-time, he never stops smiling; he's tall, brilliant, and destined for the elite life. Naturally, he's incredibly popular. No one knows our secret: that we're dating and living together. Watching him, I sometimes feel a wave of insecurity. "Am I, a plain girl with no real merits, even worthy of him?" Every time I see a cute girl flirting with him at work, my heart aches. I fear this happiness might shatter. But we share another secret. We met by chance on a matching app where we both hid our faces. We were shocked to find out we were colleagues, but even more so to find our "special tastes" were a perfect match. You see, this gentle, kind young man is actually a hardcore masochist who loves being dominated... and I'm the sadist who can tease him to my heart's content. "No one but me can satisfy Shintaro." That fact is my only source of confidence. I trace his nipples through his shirt, teasing him, peeling away his perfect mask. The sight of him panting helplessly—a side he only shows to me—is mine alone. This sense of superiority is intoxicating. ...Or so I thought. "You've gotten quite good at teasing me, haven't you?" His eyes, which seemed to be melting moments ago, suddenly burn with heat as he whispers in a sweet Kansai dialect. From here, the roles reverse with my boyfriend's sudden transformation. Our "SM Reversible Sex" begins—