Mou Kodomo ja Nain da yo?

I dropped by at a relative's house in the countryside, and found myself going out on a shopping errand together with my cousin and childhood friend Mika, when we got caught up in a rainshower. We hurriedly took shelter in a shed when Mika, who had grown curvy in all the right places, started teasing me seductively! Maybe this isn't her first time doing this?
Irritated, I ended up ravishing her in frustration, but...
(Source: Melonbooks, translated)
Note: Released at Comiket 99.