Because My Older Childhood Friend was Taken Away from Me, is It Ok for Me to Have Sex with Her Little Sister?

Haruka, my childhood friend’s older sister, whom I’d always had a crush on. For the first time in a while, the three of us—me, my best friend Masato, and Haruka—decided to hang out at Haruka’s house. Haruka, now at that age, seemed interested in having a boyfriend— “Maybe I’ve got a shot too.” My heart swelled with anticipation, but… A few days later, Haruka’s younger sister, Akiho, summoned me to the science lab. What I saw there was… The figure of the girl I’d always admired, 【Haruka】, and my best friend 【Masato】, seeking pleasure together… Though crushed by despair, my body couldn’t help but react to Haruka’s disheveled appearance. “Hehe. Poor Sota-senpai… I’ll comfort you.” Right next to Haruka and Masato having sex, I found myself seeking pleasure with the younger sister of the girl I’d always admired…