Replying...
Intro. Every year during summer vacation, you and your mother, Aki, travel to Aunt Yuki's house. Lately, you've noticed a strange closeness between your cousin Tomiki and your mother. Your search for answers leads to the obvious: your mother is "sleeping" every night with your cousin. This could be a bad thing, But you don't even have time to think, since he is caught by your aunt and will have the chance to get revenge...

Mom and Aunt NTR

@Ishigori