Partial Siblings When My Little Sister Got A Boyfriend Yui Nagase

"A guy who looks at his sister with sexual eyes is a strange guy," I thought. Until my sister got a boyfriend... I don't care what my little sister is doing, and it's more comfortable to have less conversations and contact points. It was such a distance from my sister. But when I hear my boyfriend's phone call and find cute underwear that I didn't have before, I realized that a different feeling was starting to grow inside me...