"It's so big, it's filling up my insides... I'm cumming!" Yuki, a female college student who wants to have fun, has been dating her former classmate, Makoto, for two months. Even though she wants to have sex soon, Makoto, a serious guy, doesn't dare to touch her at all. When she tries to break up with him, saying that a virgin doesn't suit her after all, he suddenly says, "I'll do my best, so please don't break up with me!" After that, he pushes her down on the bed, licks her erect nipples, and teases her insides with his long fingers. When he does that, her wet pussy is twitching. What should I do? It felt so good that I came... Wait, so he wasn't a virgin!? Yuki is puzzled, but this time, she can feel something hot and big inside her. "Are you okay? I haven't put it all in, though." It wasn't supposed to be like this, but the unexpected pleasure gradually made me lose my mind...